Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e2943720eeec26…

MALICIOUS

PDF

90.3 KB Created: 2021-06-12 23:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8d567ed20813c999d5b475f813ef9b09 SHA-1: cd842bb83bdee515d177b819863f1b555375b95c SHA-256: 87e2943720eeec269fd57a8f03316c015379e0ad01dac128ec1c526c64f2adb8
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 0.9992

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://cructi.ru/pbw?utm_term=sherlock+holmes+short+stories+pdf+easy+english PDF link annotation
    • https://tawusizigegik.weebly.com/uploads/1/3/3/9/133997505/5419498.pdfIn PDF document text
    • https://kodikitowi.weebly.com/uploads/1/3/4/7/134768405/veduverojobalupop.pdfIn PDF document text
    • https://kawolusasemosu.weebly.com/uploads/1/3/5/3/135397741/efdf8f869a1.pdfIn PDF document text
    • https://kagebavewijove.weebly.com/uploads/1/3/0/7/130740568/larajumisobo-pabidop-sigamomazo-punax.pdfIn PDF document text
    • https://medogizelolu.weebly.com/uploads/1/3/1/0/131070938/a39bc.pdfIn PDF document text
    • https://nunewefumeko.weebly.com/uploads/1/3/4/3/134307525/kixakobimoganu.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/018b391ae.pdfIn PDF document text
    • https://xusemiwo.weebly.com/uploads/1/3/4/8/134899199/tunobo.pdfIn PDF document text
    • https://wonaxegem.weebly.com/uploads/1/3/6/0/136049801/951f0fe3da716.pdfIn PDF document text
    • https://gabanifuvumot.weebly.com/uploads/1/3/4/5/134588994/2752115.pdfIn PDF document text
    • https://xejukogafowoje.weebly.com/uploads/1/3/2/6/132682905/zedewejor_mobovevotofare.pdfIn PDF document text
    • https://zarogamotelim.weebly.com/uploads/1/3/4/3/134344532/8814249.pdfIn PDF document text
    • https://rodugetimevo.weebly.com/uploads/1/3/1/4/131407281/7028906.pdfIn PDF document text
    • https://xizenarinirogav.weebly.com/uploads/1/3/1/4/131437147/bifepusupozune-fatona-xilip.pdfIn PDF document text
    • https://popejevolifol.weebly.com/uploads/1/3/4/6/134609596/mulirajavo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/95294880-3496-4979-ba70-fdd63334cf84/how_to_keep_slim_during_pregnancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea7bf452-a257-42d4-9be8-5a4128084ebd/43867810131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb295c58-7f13-4c11-9360-47228b7eacb8/bapiravunoxuker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2c87c3f-70d4-4e64-bd37-a84c82c92fe7/xubebekevojozoxab.pdfIn PDF document text
    • http://bezawagiga.pbworks.com/w/file/fetch/144560913/all_legendary_alpha_pack_items_2021.pdfIn PDF document text
    • http://xuwuziz.pbworks.com/w/file/fetch/144793476/67267635818.pdfIn PDF document text
    • http://rotulenixal.pbworks.com/w/file/fetch/144831384/62804057205.pdfIn PDF document text
    • http://wuvefetefi.pbworks.com/f/giwixinaxavugiliwolane.pdfIn PDF document text
    • http://wusagem.pbworks.com/f/marcus_aurelius_meditations_free.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001196e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196E 5836 bytes
SHA-256: da428f58aaeed9a9d39cc04d46a7936354b8c80ee6e3d1a29f97a3bd49a27691
font_01_sfnt_off00012d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2F 14028 bytes
SHA-256: c314e16a6b4ce18b9d46babb93628963a04dd8b36fc01c374194fe4c423e5ed3