Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d61a4326ae4a6c…

MALICIOUS

PDF

75.7 KB Created: 2021-02-24 23:07:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 337be6135c3ad36cef75e69a92ebf6bd SHA-1: ba2ecbf8e2a96612f9c8a5884c8cb3bffb34c553 SHA-256: 67d61a4326ae4a6c8ab6977f9a9bfd6b9a31c272e3f35a7f7a6385ec294ca4de
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document, likely delivered via spearphishing, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=what+commands+can+alexa+do+with+tv PDF link annotation
    • https://cdn.sqhk.co/kufiremikaf/jgaoHia/wevatuxedatinafegi.pdfIn PDF document text
    • http://austritkfa.com/55572407877y27yc.pdfIn PDF document text
    • https://cdn.sqhk.co/rudixika/jDXOjbh/wojufuzonupitoviradaleni.pdfIn PDF document text
    • http://arenaprobet.com/witcher_3_blood_and_wine_side_quests5fmcq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459629/normal_5fdca99d8578a.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/g5qchYu/41627102733.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxodinumoro/jepiigj/coffin_dance_meme_minecraft_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454824/normal_5fc88abaceb7b.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/abeLig7/3593694367.pdfIn PDF document text
    • https://cdn.sqhk.co/xaselavub/ifii8ji/1874482497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_6016e0868c951.pdfIn PDF document text
    • http://lessonsonline.site/youtube_video_downloader_app_mac4guj0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369508/normal_5fd03d7348177.pdfIn PDF document text
    • https://cdn.sqhk.co/wusoxopejezo/iih9iaD/football_heads_premier_league_unblocked_weebly.pdfIn PDF document text
    • https://rosotomana.weebly.com/uploads/1/3/4/5/134585450/393bfdae214.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/satulibaren/sulok.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/early_childhood_education_handbook.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_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 5316 bytes
SHA-256: c7571916f6c2ac384038790a5a2f284db467309c2570ca6052bf3443c2b43484
font_01_sfnt_off0000fce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 10688 bytes
SHA-256: c036763bb0916ad50efcedc46375f36af5de738f32b7b7e86fa510477b919296

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