Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfa2ad1be45a2f8…

MALICIOUS

PDF

84.4 KB Created: 2020-12-13 20:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ba648a263a2f9c54c73c75bc827018e3 SHA-1: 186e13d184c38f4dfbb3d79957a623f45870aec9 SHA-256: 0bfa2ad1be45a2f8fb37b2030d5bc7925833d2777002a05cc77609767b5c5287
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The primary purpose appears to be directing users to external resources, potentially for phishing or malware distribution.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/strik?utm_term=happy+new+year+2020+funny+shayari+hindi PDF link annotation
    • https://devonejejarib.weebly.com/uploads/1/3/4/6/134608322/f070d85631a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_5f9eaa89223c6.pdfIn PDF document text
    • https://pesodubebugi.weebly.com/uploads/1/3/4/2/134234841/a64dc9c.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/e0f9f.pdfIn PDF document text
    • https://nexawukuvinu.weebly.com/uploads/1/3/4/5/134578226/bofasikuraraja.pdfIn PDF document text
    • https://wuwejinetuna.weebly.com/uploads/1/3/2/6/132681176/dosazirudabop.pdfIn PDF document text
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/203654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5fc33178c0646.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408319/normal_5fc059f93d2cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370307/normal_5f8acb69c3b97.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/d0c24993-81f7-45c4-ae97-243fd821b083/60445180881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a941e3-48d4-40cd-9c5e-4142c729beb0/45238332097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dbb5e9f-dfea-4f72-8a68-2cd5307a1358/ejemplos_de_procesos_administrativos.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_off000105eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EB 5524 bytes
SHA-256: 32ae3f460829207eacd2a430969f56092ff96a514345122d4a934ed2eb986910
font_01_sfnt_off000118c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C9 12956 bytes
SHA-256: 80c53f6b0b38115dc68072c9a0bdf20363aa2e59358a42b962686fc6d9315402

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