Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9650687db612d6…

MALICIOUS

PDF

78.3 KB Created: 2021-03-16 01:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 68add7f14e451ce3fc18c15f2ab678f2 SHA-1: bcdf2f8b0e953cc342a61b67ffb213aef830ccb2 SHA-256: 7a9650687db612d631760fefea3e192864f5bc3f1a7eb4671b923c683113dcdf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO spam campaign, likely delivered via spearphishing attachment.

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://jumiwimov.ru/strik?utm_term=what+the+bible+says+about+drinking+milk PDF link annotation
    • https://degupapaji.weebly.com/uploads/1/3/0/8/130814014/1140669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451551/normal_6047d576ebe5b.pdfIn PDF document text
    • https://xuberirerumona.weebly.com/uploads/1/3/4/5/134586272/63ea85a1943b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_603ec6865525d.pdfIn PDF document text
    • http://kyponnik.online/aplicativo_de_musica_offline_android2kkbh.pdfIn PDF document text
    • http://cuzinfo.ru/gawilopaferokovakikowbs351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377414/normal_60306b922761d.pdfIn PDF document text
    • https://cdn.sqhk.co/motuvitewodi/ibO2jfq/jegatokapusiwawone.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/kUgcmiW/43403328077.pdfIn PDF document text
    • http://everydays.space/ver_pelicula_el_principito_espaol_latino78b6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428062/normal_5ffed24b7d99e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448992/normal_6046984e703cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_601de939b8cc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477164/normal_6009270bbb41a.pdfIn PDF document text
    • http://arboozfilm.com/75604519841wkhmn.pdfIn PDF document text
    • https://cdn.sqhk.co/rigepasemapa/fn6g0hj/69710087582.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_4544b4a0843a48af9959ccb90b580ffa.pdf?index=trueIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_f8b7abd842ba469aa3d036b868030415.pdf?index=trueIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_49750acd9124477289dd8b288d5a9101.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_off0000f29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 5556 bytes
SHA-256: 335df0ef8e926fe5ef4011f2c847e8853c00a9a99865cdf213452560944a8689
font_01_sfnt_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 10736 bytes
SHA-256: dded6b6f97c55bc26f2dc53ece668f011750ce5b618ed3f5342c6bc1d7950d42

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