Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0db1fc080ac706e…

MALICIOUS

PDF

75.0 KB Created: 2021-03-04 07:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fabb28813362f26aae63b1d6067df802 SHA-1: d20fe127f67cccfa96385e3ab8f72f4d9470e07a SHA-256: e0db1fc080ac706e04ba217edf2c0e1c14e371c054245a3a2e323fd51ed3fae1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document exhibits characteristics of a link farm, containing numerous external URLs pointing to potentially malicious or phishing sites. Heuristics indicate a mass of external links, with some hosted on disposable domains, suggesting an attempt to distribute malicious content or redirect users to scam pages. The ML classifier and ClamAV detection strongly support its malicious nature.

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://vilenefex.ru/award?keyword=percy+jackson+books+in+order+second+series PDF link annotation
    • https://cdn.sqhk.co/tuseliwi/WRnyqU5/98602241650.pdfIn PDF document text
    • https://cdn.sqhk.co/rajexizeba/hchahc3/zijifufavitezumutulijol.pdfIn PDF document text
    • https://zexojoru.weebly.com/uploads/1/3/1/4/131409474/358c87cb4b.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/hjifsie/pearl_jewellery_shop_near_me.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/7567990.pdfIn PDF document text
    • https://mapulanedubo.weebly.com/uploads/1/3/0/9/130969056/7879114.pdfIn PDF document text
    • http://zaranes.getenjoyment.net/playboy_song_mp3_download_djpunjab.pdfIn PDF document text
    • https://gizibufunete.weebly.com/uploads/1/3/4/4/134492386/xowijosoripogukiwive.pdfIn PDF document text
    • https://cdn.sqhk.co/vilomikov/cjdqCBN/snow_bros_appliance_co.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/wgehcNJ/vodafone_yan_mda_2020_apk_indir.pdfIn PDF document text
    • https://bejivuvepezera.weebly.com/uploads/1/3/4/4/134437422/bugerapixugizifukej.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/DEhahcv/bimodal_definition_statistics.pdfIn PDF document text
    • https://dobetabuzaduguz.weebly.com/uploads/1/3/5/3/135312815/beputelom-nemefa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ea15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA15 5284 bytes
SHA-256: bf48eb921a49e1c7fcb18ed40736527d7daee0f0aa88a19d10fedf41efe0de3c
font_01_sfnt_off0000fc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC27 10172 bytes
SHA-256: 05ae960bc10222d66293ce5c61d287488028002f044e18a02329d9240932673b

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