Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d47257f455ffbc3…

MALICIOUS

PDF

109.2 KB Created: 2021-03-25 05:28:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f9aaf605d521536a50c1e5dfc572ae8f SHA-1: 126e64fcafd348275c7956b21d09892ce5b0fbc0 SHA-256: 5d47257f455ffbc319eac40f3233a3d28cbab90f4b02bd8f36db73ed32cf9701
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xezojetit.ru/strik?utm_term=what+does+morph+mean+in+greek PDF link annotation
    • https://cdn.sqhk.co/wedifedaguju/dhrifZs/582403332.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/hageib9/velupijakivu.pdfIn PDF document text
    • https://cdn.sqhk.co/pisomuma/e1Xgec9/chainsaw_sharpening_tool_kit.pdfIn PDF document text
    • https://lutunorozepilaw.weebly.com/uploads/1/3/1/4/131438778/jaxetoripivegiv.pdfIn PDF document text
    • https://sutesesa.weebly.com/uploads/1/3/4/8/134871168/78b6fc5a086a.pdfIn PDF document text
    • http://dorightschool.com/vunuwesidolifixeforekurofdykb.pdfIn PDF document text
    • https://cdn.sqhk.co/wujamufaw/DWGgjY5/gemewu.pdfIn PDF document text
    • https://cdn.sqhk.co/wemowubire/w7gdgii/movie_theatre_mobile_al_schillinger.pdfIn PDF document text
    • https://cdn.sqhk.co/namulofilox/Qsgcpib/2451858488.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/dG5mJgg/word_nut_level_108.pdfIn PDF document text
    • http://idealslimitalia-ufficiale.site/bapejigobujusexaxo2k85.pdfIn PDF document text
    • http://copyrightshelpscenters.com/390540505179kkud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_82942cc1585048bfad2cc85c9dfd3c72.pdf?index=trueIn PDF document text
    • https://c20a02f1-eded-46de-afbf-2d7328e03b26.filesusr.com/ugd/c6fd25_05e2e971e9a943d79f1c5eda1809f1b9.pdf?index=trueIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_acacfc07d64b462d9d9c89d328650d0b.pdf?index=trueIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_f06d404c05ba4dc2af1bb982df221357.pdf?index=trueIn PDF document text
    • https://f33eab34-52c4-4f1b-91c9-7c5ec1255b8f.filesusr.com/ugd/9d0374_cd3166a749d4454d83c143bb2ce76632.pdf?index=trueIn PDF document text
    • https://d934ed86-632c-4751-b35b-4303166f997e.filesusr.com/ugd/be0f55_a3a3d51c49e64238a61da9ce2d601938.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off00016cf0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16CF0 18176 bytes
SHA-256: cf01bc0f4988446dccedefc74b2e18f75f5a4db52223d49ae4d5ad8e3f5c05f1
font_00_sfnt_off0000e71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 5684 bytes
SHA-256: b860fb277252ee9b20429d811032d938c2d219a75430a49174b6e9a82640b652
font_01_sfnt_off0000faf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF9 5204 bytes
SHA-256: 3ca3b4f2b3bb1721328540c1f1854f3354a58cfe5dd373e9a42874456415e71c
font_02_sfnt_off00010c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8A 2656 bytes
SHA-256: c206ac4eca120f096112d408dff6b33a2f721090936d80486df636e1cd240fde
font_03_sfnt_off00011790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11790 2328 bytes
SHA-256: 3702365b3034b9d7945da23b991b5e2ac3f8bb06d1ba3be7e5ba1b5d8dd48c9f
font_04_sfnt_off00012247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12247 2108 bytes
SHA-256: e66bd646ff29f48b94a898642357a1d5295b77faffa0bd70eb77acb4aebc9a97
font_05_sfnt_off00012c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C13 6640 bytes
SHA-256: eca62b72654736461a635ba366d09d794777fd95c58152d2b251becdfce657e0
font_06_sfnt_off00013db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB0 15520 bytes
SHA-256: 47c4c7120444afd2cb51bc761c79853d760e21ea07caa3e6d2bd65f1b72316d9
font_08_sfnt_off00018980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18980 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
font_09_sfnt_off00019781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19781 3276 bytes
SHA-256: 51c1d5fa29146058fbc649eac7766b85490f6942bd67486bd14cc46e9087474c

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