Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ade987805362c72…

MALICIOUS

PDF

68.4 KB Created: 2020-12-23 18:46:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 6fe5f6978de3a2baef531f749d4f2aee SHA-1: 42115f3ee28456716c2f1c909d56779eddc029d1 SHA-256: 8ade987805362c72a8d659a7983b760827dc4fb401ffb6f8c92c3fca89915262
244 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs pointing to external PDF files hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One URL, 'https://cctraff.ru/strik?utm_term=monster+evolution+books', is flagged as a malicious redirector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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://cctraff.ru/strik?utm_term=monster+evolution+books In PDF document text
    • https://dipidedi.weebly.com/uploads/1/3/2/8/132815933/negizofivanit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369633/normal_5f939fd512e47.pdfIn PDF document text
    • https://cdn.sqhk.co/gotirawuz/1gi7jcR/89964010378.pdfIn PDF document text
    • https://cdn.sqhk.co/zesunotu/IMRejep/knight_rider_2008.pdfIn PDF document text
    • https://cdn.sqhk.co/razupojoja/jiigji3/2374245059.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/mukobuf.pdfIn PDF document text
    • https://cdn.sqhk.co/dujujema/jcii2jb/9221458739.pdfIn PDF document text
    • https://gedaxafi.weebly.com/uploads/1/3/4/3/134340736/bizibejar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492272/normal_5fcb098e9af44.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebosatu/KBje47t/top_10_gospel_songs_in_nigeria_2020.pdfIn PDF document text
    • https://zufuxanibagi.weebly.com/uploads/1/3/4/5/134586570/bulegejed.pdfIn PDF document text
    • https://kukevukoleguko.weebly.com/uploads/1/3/4/2/134265740/jopofivo.pdfIn PDF document text
    • https://cdn.sqhk.co/mokavokaven/RIMDVpm/reckless_getaway_2_wiki.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/zirojopemup/rufikorokodorodasuwob.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/http_bearer_token_format.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_off0000d2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AF 4740 bytes
SHA-256: 7fa93b4476682f4908f4889df60fe044d4f9a0eb62706182e6de6640aab0a328
font_01_sfnt_off0000e2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F0 9976 bytes
SHA-256: ed24fdd2bf1457a0e156f909d4222cac70ee86c7b5266437c198cd45b2241cff

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