Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb6d43dec77d199…

MALICIOUS

PDF

78.0 KB Created: 2021-01-10 20:19:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 607aaa55ccf211819fd424e5fa80f991 SHA-1: 65b5a2e0b2d372a58895e4e8ee5dcfa9fbff7960 SHA-256: 7cb6d43dec77d199c2d8a481cd0532769eea06e565cf9cc3318d9a18652f77dd
244 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting or known malicious redirectors, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute malware or phishing content through these links. The embedded URL `https://traffmen.ru/wb?keyword=cat%20running%20around%20at%20night%20meme` is a critical indicator of malicious redirection.

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
  • 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.
  • 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.
  • 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://traffmen.ru/wb?keyword=cat%20running%20around%20at%20night%20meme In PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/janixiwuradowi.pdfIn PDF document text
    • https://xikalevu.weebly.com/uploads/1/3/4/3/134319979/8897386.pdfIn PDF document text
    • https://livekurot.weebly.com/uploads/1/3/4/4/134443702/pupetixazagu_pimenaxa_rimogix.pdfIn PDF document text
    • https://cdn.sqhk.co/sulubejes/fjckjfk/25668882667.pdfIn PDF document text
    • https://cdn.sqhk.co/dojopaxitovi/gcahhgi/davali.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/hdighfQ/viruswarzen_bei_kindern.pdfIn PDF document text
    • https://mosaminaworite.weebly.com/uploads/1/3/1/6/131636744/jivegategekevij.pdfIn PDF document text
    • https://site-1168175.mozfiles.com/files/1168175/wapigeperivuriwemasaz.pdfIn PDF document text
    • https://cdn.sqhk.co/xowuzaseku/fghjfBB/83413857970.pdfIn PDF document text
    • https://lofidebonejiniz.weebly.com/uploads/1/3/5/3/135334880/4674143.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/lepefi/boitempo_carlos_drummond_de_andrade.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/waxajofewugexegenufe.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_off0000f6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DD 4932 bytes
SHA-256: af03def12a1b737b063d34c5475b85a197a8f7f6642d1ee6a7951325e3b89818
font_01_sfnt_off00010773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10773 10428 bytes
SHA-256: e2f22990f69b0aa6a557c58b12c8acfdb13c50156e4901a6f67a9e7a88b69c17

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