Malicious PDF — malware analysis report

Static analysis result for SHA-256 cccd3460d50a3252…

MALICIOUS

PDF

71.6 KB Created: 2021-02-28 12:28:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0853563f5c2b17fd85a8ce0e478b2336 SHA-1: c8d966df7ca8625b92f47751816ab2ecc6beb108 SHA-256: cccd3460d50a32525928a539a1aca8c4dd96de8fa584094654d35264e54cdce4
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs pointing to various domains, many hosted on disposable platforms like Weebly. This suggests the document's primary purpose is to redirect users to potentially malicious or phishing websites, possibly disguised as legitimate content like product information or documents.

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://pelibifir.ru/123?utm_term=apc+be550g-gr+power-saving+back-ups+es+550va PDF link annotation
    • https://lulipexo.weebly.com/uploads/1/3/5/2/135294167/xadiga-kazemajamu-dalevufoxuzel.pdfIn PDF document text
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/pufusuvifov_tugifibegajoxu_jixug_loxawojaxow.pdfIn PDF document text
    • http://idealica-itufficiale.website/70125583879wddfm.pdfIn PDF document text
    • http://lighttravel-ng.com/assumption_college_kilmore_uniforme4c59.pdfIn PDF document text
    • https://fazijexin.weebly.com/uploads/1/3/2/7/132741066/dabufakilar-marulogeluwag-velofiz-fevijur.pdfIn PDF document text
    • https://puwulafu.weebly.com/uploads/1/3/5/3/135329465/kefikukib-semirosutepug.pdfIn PDF document text
    • https://zejebamusij.weebly.com/uploads/1/3/2/3/132302936/makabip_dunimilepesus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383136/normal_5febb3a5ac5ec.pdfIn PDF document text
    • https://vewudati.weebly.com/uploads/1/3/0/8/130873955/lifepofamusa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445337/normal_5ff2bbce3ef89.pdfIn PDF document text
    • https://kenaveduku.weebly.com/uploads/1/3/0/8/130813649/pofigoripukuvimuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_6024bc7a2875f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369329/normal_5ff07968027f7.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/f8608dad4b0.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/114375877888vyf6.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/a7jbhan/space_jam_2_trailer_espanol_latino.pdfIn PDF document text
    • http://clientesdkb.com/iihf_world_championship_2021_tickets16nms.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/tinajabizoreguf/aubrey_maturin_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/video_player_for_iphone.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_off0000d985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD985 5712 bytes
SHA-256: 528e1ce309edb6324583f3e50bacf3b2a73b1786a375b3d8ada660697a1928c0
font_01_sfnt_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 10520 bytes
SHA-256: f3f1d3ec3f6f696922773f21cb0cdc32a900059a558c2b189a252121e94d10b8