Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb929fc8e7e1448…

MALICIOUS

PDF

74.5 KB Created: 2021-01-05 21:28:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 87f023d67546a0ef174eda071e4eef86 SHA-1: 71030fe8c1cee07613b51e6827b59331452c5b1b SHA-256: bcb929fc8e7e1448fb47160b2b1524d7fa8018e39f33590a568a7365238af1f6
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded links. One of these links, 'https://traffmen.ru/aws?utm_term=perforated+sheet+pan', points to known malicious redirector infrastructure. The document also hosts a large number of links on disposable hosting, suggesting a link farm or phishing campaign. No scripts were extracted, and the document body was heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=perforated+sheet+pan In PDF document text
    • https://cdn.sqhk.co/patemugimej/JsigGgd/42032127031.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/5436318.pdfIn PDF document text
    • https://mibonujatupogu.weebly.com/uploads/1/3/5/2/135297119/08be78e708.pdfIn PDF document text
    • https://ligibumifi.weebly.com/uploads/1/3/4/6/134647936/3d3dd17.pdfIn PDF document text
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/bujobomalukotu.pdfIn PDF document text
    • https://bugadubotureje.weebly.com/uploads/1/3/4/4/134468403/6f6cdeb936c10.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/224779f7-08c7-438f-a2f9-965a70d0a1bc/sujet_e2_bac_pro_eleec.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/99981508776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0451191-a54c-471a-90f1-2ef96c8eb96b/how_to_know_if_you_get_into_wow_classic_beta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56022da4-0efd-4f0a-a10c-db24025a3c3b/dofafovanozavovalexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/307ef881-e386-4044-9a2f-f0332f2cb340/84183032731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff3c7e4-9001-41a2-b254-8f9c5708dd67/crown_forklift_error_code_309.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8686d482-71c9-4fbf-9914-cff1fee4dba2/lebifamasujonuwatijevuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b0e5750-e38e-4e58-a673-c79c579f1ae7/cell_phone_lot_at_jfk_airport.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b975a5db-09f3-41ec-bf32-3433d27b66a3/93692511382.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/18276117373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf3923f-264c-45b9-8f1a-495fd7f35bf2/nidalee_guide_s61.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_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 5096 bytes
SHA-256: ecc219fb1540477442071f7785f9a3199767fa9e48e51304755dabc2ec4399a5
font_01_sfnt_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 11456 bytes
SHA-256: 8ab0ff4ec69e07a13b45e3ff6578e4443d5a88e5fb631dad6b90fa297715c3be