Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fe31086513fb18…

MALICIOUS

PDF

89.9 KB Created: 2021-01-02 14:45:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 59b2144e87c714797ef2c962e9b5f14f SHA-1: 1747a3dfbc69d64b6f76d3126c25d5f31c8f7b2d SHA-256: 16fe31086513fb18ff0e0d310f08d02bde26be85e4b5e69e0a266973fd8f4451
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating it likely serves as a phishing or malware distribution vector. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to direct users to external, potentially harmful, websites.

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://gettraff.ru/123?utm_term=java+servlet+complete+reference+pdf In PDF document text
    • https://mujiborabasovu.weebly.com/uploads/1/3/4/5/134590634/diwif.pdfIn PDF document text
    • https://gipulafu.weebly.com/uploads/1/3/4/4/134442702/4dc64.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/7702792.pdfIn PDF document text
    • https://gitufigekuxos.weebly.com/uploads/1/3/4/6/134634758/863965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372073/normal_5fda92cfbca4f.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/batagebexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409627/normal_5fa0cfcdb07c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402711/normal_5fa29892a9c15.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/37ffc9c4-c7b2-46be-932e-7ffde70d952c/votuwiwaxijapuxobogizuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68e5ee4f-e0de-4cb5-ba8b-cfd4d5b0f35b/91081231756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5049c917-aa5c-4e56-8dd6-8a8cdddb5df0/62060168129.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/8786268218.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB1 5088 bytes
SHA-256: a0fc7b546315f45bb2fe44edc3640dfe3e6eed36251820d74fd70067e0908e92
font_01_sfnt_off00011ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE7 14332 bytes
SHA-256: ef64031f5d74f6bccd476db73dbcca08444b3c0331109c4b1e374369bc54416e
font_02_sfnt_off00014cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CAD 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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