Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0a0a647e2a9cb9…

MALICIOUS

PDF

69.4 KB Created: 2021-02-11 08:00:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 442ef70a0d6bf12b68d2631238794cb8 SHA-1: 2917a40f6b0b32419cb345dac68f1f141d888064 SHA-256: 2a0a0a647e2a9cb9008227ec9994111427eeadc14444fd802bdd58bb9abebc34
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized content that can mask malicious links. No scripts were extracted, but the presence of many external links points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/aws?utm_term=definition+of+technology+journal+pdf PDF link annotation
    • https://cdn.sqhk.co/girolivudafo/heqhIYR/angel_stone_rpg_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/c0jhhja/electronic_project_boxes_metal.pdfIn PDF document text
    • http://aires.fun/grand_street_racing_tour_gsrt7sfuc.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/dgijcfv/childrens_playroom_furniture_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/revinoxu/higewA4/86456122035.pdfIn PDF document text
    • http://shoop-ff.ru/92816904942cuh7w.pdfIn PDF document text
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/wumudebabotiniteri.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/cartina_politica_pugliadged7.pdfIn PDF document text
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/ratibinezawud_menuzajiw_zikilewaxir_najelojok.pdfIn PDF document text
    • https://sterlingpr.comIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/afdcc_formation_credit_manager.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/51996970082.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/68970063504.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/beautiful_quotes_images_free.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/competency_framework_powerpoint_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/acrobat_reader_8.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_off0000d159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD159 5416 bytes
SHA-256: 9d91a61899d3c30a61f928d1d0d611e7c8e1c53461f13bde24050123056d9317
font_01_sfnt_off0000e3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 10820 bytes
SHA-256: 533221e883788c03a3788b5a2d8f45e0e1207944fa5911e4a14176b01017dd58

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