Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf1fd574ebcc589…

MALICIOUS

PDF

88.4 KB Created: 2021-03-23 08:21:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16109fff2ff12d58f31d2833c1dfc9eb SHA-1: 2ba2e8bfb8a99903d5d845492e2e823c654717da SHA-256: 9cf1fd574ebcc589f2c7f613158ff5b26648acbbd8b9d82e6ff534c18448a1cf
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards malicious intent, likely to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=darth+plagueis+pdf+espa%25C3%25B1ol
    • https://tinabatof.weebly.com/uploads/1/3/0/7/130776088/suzirova.pdf
    • https://cdn-cms.f-static.net/uploads/4425929/normal_601d1248b803f.pdf
    • https://bibuzutevokad.weebly.com/uploads/1/3/4/6/134634257/4754335.pdf
    • https://cdn-cms.f-static.net/uploads/4453098/normal_5fe8d7fe96307.pdf
    • https://nasebawesor.weebly.com/uploads/1/3/1/6/131637432/guxar_nabesenow_saret.pdf
    • https://pobikutilun.weebly.com/uploads/1/3/4/8/134871216/pozadizeteru-zebitepixeri-rogirajuzawaw.pdf
    • https://cdn.sqhk.co/binuwaxe/xhezQib/10404738371.pdf
    • https://cdn.sqhk.co/goxupolofodi/KWyjhjj/88626305537.pdf
    • http://vokifudeni.22web.org/bevexabulovezemuxib.pdf
    • https://cdn.sqhk.co/wisewuguv/jDWidMX/javibazogofogigozogubopuv.pdf
    • https://cdn.sqhk.co/piwewupovo/jSK72Gr/zomasevajibijisufeperudo.pdf
    • https://cdn.sqhk.co/bulunazi/dkhdKhe/bouncy_ball_games_to_play_at_home.pdf
    • https://cdn.sqhk.co/xiladuxe/OjasMgi/xaripesogede.pdf
    • https://cdn-cms.f-static.net/uploads/4413975/normal_6018546640299.pdf
    • https://petobaxiteru.weebly.com/uploads/1/3/1/4/131407236/nidufuvobazukezonek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://retipike.rf.gd/tabel_apgar_score.pdf
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_9095d8a6465a4b4e95b2beec0721692f.pdf?index=true
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_5b430b3a63a24c21913b3a2ee23fed1c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001199b.bin
eed7cb934b5236cef2254ce13097b7fe664db3d313d120a700ac23c6910819a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1199B 5516 bytes
font_01_sfnt_off00012c17.bin
bf65413330abe7b528ee06044a653fad6cb98b10bb92287b66cba409afbb2281
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C17 11896 bytes