Malicious PDF — malware analysis report

Static analysis result for SHA-256 654f9c032357d171…

MALICIOUS

PDF

69.8 KB Created: 2020-12-25 08:40:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: aaaf106b9651eaf25f510f6b63bfcedb SHA-1: ec1ea8f66088bf562ffeaea31624824ae7743872 SHA-256: 654f9c032357d171c797a788b20a7d2ef968edc2867382b4ff07eb9c6b26dadc
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating it likely serves as a phishing or malicious redirector. It contains a large number of embedded URLs pointing to various external sites, many hosted on disposable domains, suggesting a link farm designed to manipulate search results or direct users to malicious content. The presence of a link to 'traffmen.ru' further supports the redirector hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/123?utm_term=oil+scavenge+pump In PDF document text
    • https://static.s123-cdn-static.com/uploads/4486563/normal_5fdf2cc55e284.pdfIn PDF document text
    • https://gepekipaw.weebly.com/uploads/1/3/5/3/135304147/0cda98d09.pdfIn PDF document text
    • https://depumubawaminuk.weebly.com/uploads/1/3/4/2/134236244/f13c831869431a.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/4KNjPih/pound_cake_recipe_from_scratch_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/gcRiemD/xukenowarufemebuvejunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378856/normal_5f9a818d754e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377401/normal_5fd99525a6e9d.pdfIn PDF document text
    • https://zexivuwesime.weebly.com/uploads/1/3/4/3/134356920/sijor.pdfIn PDF document text
    • https://sewatebemadog.weebly.com/uploads/1/3/1/1/131164437/25c55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5fbcf749794d1.pdfIn PDF document text
    • https://nofizosol.weebly.com/uploads/1/3/4/5/134500220/tazirofu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382423/normal_5fdd7b3f63b16.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/gazelexepuboxigeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_5fd68bbe99607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448096/normal_5fadbbc1243cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fa9be68-5948-402d-99ea-241b4389ddfa/muraxeki.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_off0000d480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD480 5244 bytes
SHA-256: 3b9e2684d1cb80ef7309ce943e4be877868c0ee884113b09c7e74b1ecfcc09cd
font_01_sfnt_off0000e650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 10668 bytes
SHA-256: 8985ac4fb2b69f37f4b87cb443cbd167720f5e6c74b0bdce9d4ed7099e2b6751

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