Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed15673d5144d34f…

MALICIOUS

PDF

112.9 KB Created: 2021-04-07 15:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 606aa44844c494ce8dcd0c5c75975ad5 SHA-1: 57f56ba6154a2a9aa099f705b901a9af89dfe438 SHA-256: ed15673d5144d34f686513960a1b204bbe0ec04cba2a9d32cbcdcc6ec7ce7108
244 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=what+caused+the+great+depression+dbq+answers In PDF document text
    • http://nomudepalak.medianewsonline.com/mapa_de_carreteras_de_mexico.pdfIn PDF document text
    • https://wufisosudima.weebly.com/uploads/1/3/0/8/130874090/jemukiridubop.pdfIn PDF document text
    • http://ninufejuvosixir.22web.org/astronomical_terms_and_definitions.pdfIn PDF document text
    • https://lanekugufer.weebly.com/uploads/1/3/5/3/135351315/9725690.pdfIn PDF document text
    • https://suxozunepewax.weebly.com/uploads/1/3/2/8/132814427/4999774.pdfIn PDF document text
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/b66f1bc98.pdfIn PDF document text
    • http://vegunax.getenjoyment.net/wirojirewikatejasebufu.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/hbhd8uU/44792510778.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxinugad/Kjfggi5/treasure_island_hidden_object_mystery_game_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/gFhgqW4/26007860768.pdfIn PDF document text
    • https://wavuzujez.weebly.com/uploads/1/3/1/4/131406867/72cc857ff7.pdfIn PDF document text
    • https://wogefusupe.weebly.com/uploads/1/3/0/7/130740138/vuwanomok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_cf3e9b4efbc945c792f528489e5cd6f7.pdf?index=trueIn PDF document text
    • https://591379ed-26d0-4405-baa7-5b8dadede013.filesusr.com/ugd/866ffa_d967f1fce2724f6db5b2811f2d978713.pdf?index=trueIn PDF document text
    • http://miwufojo.epizy.com/bitomaruselabemapavumib.pdfIn PDF document text
    • http://fudedeki.rf.gd/bmx_crank_arm_length_guide.pdfIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_c60ea47a44254c1f824edbbb3024c21b.pdf?index=trueIn PDF document text
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_4c449df793e54156ab1e07a980e01418.pdf?index=trueIn PDF document text
    • http://raxajuneneg.epizy.com/what_is_curriculum_design_in_hindi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00018746.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18746 17976 bytes
SHA-256: 723558eec7b4432d7cf50db7230093db7a604084d5e16d7b1a5aec1fb9a96a3e
font_00_sfnt_off00011e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E93 6984 bytes
SHA-256: 981c4426b455e2b753a57cb2646d6f7f689f0e5dc176ba1a728fe728f7bcbc87
font_01_sfnt_off0001302e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302E 3908 bytes
SHA-256: bf0c782dfaab9060d8c14bceb777e005017a8912cb53bbd359bfa97fb9be60f9
font_02_sfnt_off00013e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2B 5672 bytes
SHA-256: 86a513850c3670cfc65bd0bd24fe0e405cbf0d53dbaff1005f7eb4daf48ca009
font_03_sfnt_off00015184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15184 16300 bytes
SHA-256: 953e74e0ab1d3918da981679be24302423c288c9532bcdf5cbe05995791201a1
font_05_sfnt_off0001a33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A33A 6280 bytes
SHA-256: efa16988fcbd639fd1cefe810dab41f7c90c9a9239bbbe7d8533ac81c7a4cd9c

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