Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b38bc81e96ec87…

MALICIOUS

PDF

80.0 KB Created: 2021-04-08 04:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 580d53ebc57749fa848ffde65243c673 SHA-1: ec4adc01c40d7fdd021b6417c4ac145985530b2c SHA-256: 70b38bc81e96ec87d6c0ca399e3d2a21707a78bc66e35f8b56500e4f65a74f46
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/123?utm_term=guide+to+intermittent+fasting+dr+fung PDF link annotation
    • https://cdn.sqhk.co/datimemovuko/pDhhyf2/tear_dress_game_apk.pdfIn PDF document text
    • http://dojimifarekajiw.iblogger.org/domain-_driven_design_distilled.pdfIn PDF document text
    • https://cdn.sqhk.co/judebivon/Hgfxidd/two_digit_multiplication_worksheet_printable.pdfIn PDF document text
    • http://pogadai.xyz/kudogagotur58s.pdfIn PDF document text
    • http://befigter.xyz/aade7_goal_sheet89rf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450511/normal_5fe4ef9d14473.pdfIn PDF document text
    • http://razvivatel.blog/canon_eos_5d_mk_iv_manual3bts0.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/Xri9Rjb/video_repeat_loop.pdfIn PDF document text
    • https://cdn.sqhk.co/kugorazig/iaPicih/boloranuwe.pdfIn PDF document text
    • https://cdn.sqhk.co/pizokifuxe/bicJUq9/dirt_road_trucker_3d_mod_apk.pdfIn PDF document text
    • http://nusorogexirexi.22web.org/apel_jasnogrski_modlitwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_605fb9277b01c.pdfIn PDF document text
    • http://maxefeb.iblogger.org/94084884782.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_a29ef05e7ed74176af38ab5772faa43a.pdf?index=trueIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_0c71ff7620f145fc80a3e0785296aaf2.pdf?index=trueIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_df51e32450b24d4da31cc0a4beee8630.pdf?index=trueIn PDF document text
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_4a0da5528458434fa52106068af35763.pdf?index=trueIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_32d8806b201748888c887db72d0b8436.pdf?index=trueIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_5147cf7c183b49d687adf6909f57a277.pdf?index=trueIn PDF document text
    • http://wilafavibu.rf.gd/free_kindergarten_alphabet_worksheets.pdfIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_ea57cd444d904946b729ef781cfb8d39.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 5224 bytes
SHA-256: e1e46fb7fa5591541a219b6b01deb82cd7ecd1486cb0e49b3ddd15a880aebd91
font_01_sfnt_off00010d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 11012 bytes
SHA-256: f52224688947c351a78eb4280cd50c93a4239ba84d6731464105911a92ee688b