Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5518797322482b4…

MALICIOUS

PDF

91.5 KB Created: 2021-02-18 23:48:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 87ef180afe1787caa18581c9b5c89b44 SHA-1: c182951fcc19a500fe2db6a478cb0d66e8fa6879 SHA-256: d5518797322482b400b4243167e61f434b68e725ebc0e43fcb991f37fdec5b4f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/wb?keyword=2011%20ferrari%20california%20msrp PDF link annotation
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/7743783f2198.pdfIn PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/1284292.pdfIn PDF document text
    • http://livethailand.fun/2199332778lub22.pdfIn PDF document text
    • https://cdn.sqhk.co/xafukapewe/bhVvtrw/nations_in_combat_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/wibafozadil/qjjNn7e/19343333576.pdfIn PDF document text
    • http://fullstacket.online/singham_full_movie_hdp5sy3.pdfIn PDF document text
    • http://disetikala.22web.org/great_crested_newt_mitigation_guidelines_2001.pdfIn PDF document text
    • https://gafewifem.weebly.com/uploads/1/3/1/3/131379815/4074254.pdfIn PDF document text
    • http://zinuxuf.22web.org/external_style_sheet_in_html_css.pdfIn PDF document text
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/91f409e4ff00.pdfIn PDF document text
    • https://cdn.sqhk.co/dujujema/KfZ1hi6/59246870293.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/jjFh8hb/fozebomugagul.pdfIn PDF document text
    • https://cdn.sqhk.co/pifajaloro/jdIt8Ew/g_stomper_producer_tutorial.pdfIn PDF document text
    • https://wakevilapiz.weebly.com/uploads/1/3/4/9/134903367/resuzavaro.pdfIn PDF document text
    • https://dupemokuko.weebly.com/uploads/1/3/4/7/134759865/jibimekaxezovesakaza.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/android_studio_requirements_hardwarehh781.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dupofax.rf.gd/vagowejuvigisukavopazuzi.pdfIn PDF document text
    • http://dilalixurapa.epizy.com/how_to_fix_my_maytag_neptune_washer.pdfIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD668 19912 bytes
SHA-256: cf381bf9bb46894317a2312cc08d1e2e1c805a19e56c0aaf38f889ad895db583
font_01_sfnt_off000110cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CC 5392 bytes
SHA-256: 6d5a824227e528684f97c48f57721a74df1baf2cbb941439ad8b160b4f8cd595
font_02_sfnt_off00012313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 11612 bytes
SHA-256: e2acbab06faf4480c55e2e3d37a537ff3985de0e33e82019a09f3617cbec6091
font_03_sfnt_off00014b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1B 16136 bytes
SHA-256: 92dbc52790f22a182146066bb494a5ed525e9e770ab6154a634edafe98d523b6

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