Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfaa9e4f4ca2b247…

MALICIOUS

PDF

75.4 KB Created: 2021-02-07 23:18:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8fedcd1a14f5ab604b19c213097323f6 SHA-1: 6cef30b7e30f0751df2758297bf1340721bfc5c5 SHA-256: cfaa9e4f4ca2b247a20f8a641b86a2ad11c288104c41a19a2d3f5d02696e5076
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 and Weebly hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/aws?utm_term=lullaby+of+woe+sheet+music+piano PDF link annotation
    • https://gimoxawoja.weebly.com/uploads/1/3/1/3/131380550/4c2dd.pdfIn PDF document text
    • http://8gusevshop.website/26898448237pn8tg.pdfIn PDF document text
    • https://cdn.sqhk.co/rokabumake/mijcpia/samukixunibadonika.pdfIn PDF document text
    • https://cdn.sqhk.co/wutalididow/d8UheMF/53270823423.pdfIn PDF document text
    • http://amandeepsadyora.com/zenuwowadixolisewawemisgo76q.pdfIn PDF document text
    • http://basvuruizleme.online/l.o.l_imagenes_para_imprimirnrcdn.pdfIn PDF document text
    • https://zokutiwako.weebly.com/uploads/1/3/0/8/130873782/savarolijes.pdfIn PDF document text
    • http://bioforcecolumbia.site/aao_de_exigir_contasf9ntm.pdfIn PDF document text
    • https://xudagemiribu.weebly.com/uploads/1/3/1/3/131378943/2552692.pdfIn PDF document text
    • https://mivopolidenez.weebly.com/uploads/1/3/4/3/134349928/mavogazujupa.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/2442744.pdfIn PDF document text
    • http://podarokinsta.online/android_sdk_unity_manualbefgi.pdfIn PDF document text
    • http://ig-objectionform.com/mapamundi_blanco_y_negro_con_nombresqja2t.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/jb2c4yl/bobevatugu.pdfIn PDF document text
    • http://converstarget.ru/pokemon_alola_league_game_gba4thkm.pdfIn PDF document text
    • http://theboldpantsproject.com/9668498697lyi6r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zakunafu/kirofesuxejeniredekofame.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/birthday_song_punjabi_ringtone.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_off0000ea01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA01 5432 bytes
SHA-256: 173924a0060a5b38aad682338a79a0e9e9a7100fbfb43e0da743c138fa893fa9
font_01_sfnt_off0000fc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 10420 bytes
SHA-256: 9fb48845c2a60fc905cce64c13ffb40fa613f8cc407ef9f36f1e78db7bb02b64

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