Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3fffff3ecd00a59…

MALICIOUS

PDF

71.8 KB Created: 2021-01-11 08:09:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cb6377503845c8e9702daaadfb3d8652 SHA-1: e293537d4aa0d0ef2230c836bc7e431607a5e894 SHA-256: e3fffff3ecd00a5913cb9a864ed81d6effe20792ac0e15b6bb3922ed7a2b6b76
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a critical redirector link to 'cctraff.ru' and a large number of links to other PDFs, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=nutrition+information+subway+meatball+sub In PDF document text
    • https://site-1172701.mozfiles.com/files/1172701/wivarazipumug.pdfIn PDF document text
    • https://cdn.sqhk.co/nesunarimu/bNKDidp/five_kicks_voodoo.pdfIn PDF document text
    • https://cdn.sqhk.co/lotazoza/ROuKjAS/bimikefoxobotinexopulu.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/h5rjigf/glow_in_the_dark_beer_pong_table_spencers.pdfIn PDF document text
    • https://cdn.sqhk.co/javijaxim/lNhiaif/sefigejenupapejemejebapi.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/VxuhKBF/83873777849.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/udgiMjf/running_chicken_meme_generator.pdfIn PDF document text
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/7822792.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/bgfhe73/monkey_wrench_foo_fighters.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kevava/seporesazizimu.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/bpops_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/atp_draw_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/bonds_mens_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/13844869773.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/37640009418.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF03 5100 bytes
SHA-256: a5241eadd49607a520c4b2ac228927398a954b1fc7f3ca8baf9bc620cfd56da2
font_01_sfnt_off0000e056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 10272 bytes
SHA-256: 0daaa0123fbf81a134f7dadab51bede2b7980eea48a3dbc5e12e62c14452d891
font_02_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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