Malicious PDF — malware analysis report

Static analysis result for SHA-256 7670e79278d475ca…

MALICIOUS

PDF

72.3 KB Created: 2020-12-27 12:51:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5f680dbda8b8a2289c2ba6d711477ea8 SHA-1: b823e2e8a74172b7f07c23830ef842e127e3e5e5 SHA-256: 7670e79278d475ca05c23e263ddd5503fd1f4cfffc880b314dec311c727e628d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external links, including one to 'trafffi.ru', which is flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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=guess+the+celebrity+eyes+buzzfeed PDF link annotation
    • https://vugifalufaduzo.weebly.com/uploads/1/3/4/8/134889855/logub.pdfIn PDF document text
    • https://bozobamawokoruv.weebly.com/uploads/1/3/4/3/134350924/8861069.pdfIn PDF document text
    • https://wemakevarovafa.weebly.com/uploads/1/3/4/6/134636541/b3b921.pdfIn PDF document text
    • https://gililizu.weebly.com/uploads/1/3/4/7/134770310/5641431a64.pdfIn PDF document text
    • https://cdn.sqhk.co/tesinogopano/gelghu6/vitamin_c_serum.pdfIn PDF document text
    • https://fekugutupufug.weebly.com/uploads/1/3/4/8/134876907/jaruvibel-sagifep.pdfIn PDF document text
    • https://cdn.sqhk.co/duwewofowus/ighii5x/zuzafebavoruvuzuverot.pdfIn PDF document text
    • https://cdn.sqhk.co/norifasil/jgjhgjf/alphabet_wolof.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/e8aa24dd-426a-4d13-a489-106f5a7976a1/pemag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42c65b9b-7920-4372-bba8-18f1e9a26e5e/xotitari.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/nhl_hockey_score_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/tft_rengar_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edadd013-2a53-4fc4-9a39-ec23acc80329/28350946470.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_off0000de05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE05 5224 bytes
SHA-256: f30c7c014f1272598d2a9a0e4a1bdd05e7b1c358b7764b8c5eb81c61f9b6716b
font_01_sfnt_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 10840 bytes
SHA-256: 7108f7cc3890d2015276f119bd3e5bf82865e8b02020ce673ac444662f0a2b3b

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