Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d689ff62d829d9…

MALICIOUS

PDF

70.6 KB Created: 2020-12-16 03:42:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 034d4876a47d07d330a910fb4248fb86 SHA-1: 986bd960b8a4094c30c85d709011622397cc21b7 SHA-256: b7d689ff62d829d9adc106ec4b1f5616e42d2d694febe1dfea91ec0b6aad85c4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. One of the embedded URIs, 'https://traffine.ru/123?utm_term=titanium+backup+no+root+apk', indicates a lure related to downloading an Android application, likely a phishing tactic.

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://traffine.ru/123?utm_term=titanium+backup+no+root+apk PDF link annotation
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/4539942.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/cf0c7.pdfIn PDF document text
    • https://wosabizovores.weebly.com/uploads/1/3/4/5/134577485/ba58c15a3a8b66.pdfIn PDF document text
    • https://karezolakep.weebly.com/uploads/1/3/1/3/131398125/1346563.pdfIn PDF document text
    • https://rogujodur.weebly.com/uploads/1/3/4/8/134899240/ab815c97dcba15f.pdfIn PDF document text
    • https://dukezowe.weebly.com/uploads/1/3/4/6/134602160/dibajefelusize.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/misewaxewirarojujow.pdfIn PDF document text
    • https://tatabano.weebly.com/uploads/1/3/4/8/134850833/dakaja_sefarabamo_zajat.pdfIn PDF document text
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/gupiwoj.pdfIn PDF document text
    • https://venifamu.weebly.com/uploads/1/3/4/5/134501621/2a4c1f8.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/83065310-4649-47d9-81f1-e726c3abcecb/12154998590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1765ff0f-1cf1-47af-93a5-99c89f22ed12/52140823070.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_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 5020 bytes
SHA-256: cbd833ae74e6d85c3eeed79c59bb6d641ba49cdccb132b82cee0d9af75d5c994
font_01_sfnt_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 11196 bytes
SHA-256: bbf36efe9c3f297e45c8448963839aeb10f3191133217a0893fc4ad429c18171

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