Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1475af921173bb3…

MALICIOUS

PDF

74.7 KB Created: 2021-01-11 14:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b82c54b0814637e080a631292b55bdf0 SHA-1: 63522ba41532523b5a56e47ccbf6f1e5c853d2ff SHA-256: a1475af921173bb3344b8a117a913c91947ed4d038930d0d4ad87cfed3dfaad0
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting services and are associated with link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/aws?utm_term=briefing+template+for+web+design PDF link annotation
    • https://cdn.sqhk.co/ruduligived/jcoidii/30757331935.pdfIn PDF document text
    • https://modofanapaf.weebly.com/uploads/1/3/4/6/134676621/4662148.pdfIn PDF document text
    • https://fudexevanege.weebly.com/uploads/1/3/0/8/130814713/lajazerunevixuwi.pdfIn PDF document text
    • https://site-1199467.mozfiles.com/files/1199467/rider_waite_tarot_deck.pdfIn PDF document text
    • https://davijoxo.weebly.com/uploads/1/3/4/3/134357566/lesiv-luvoxopugoxid-fezokafikoxizep.pdfIn PDF document text
    • https://xitawameduzip.weebly.com/uploads/1/3/4/5/134511141/1772162.pdfIn PDF document text
    • https://site-1168027.mozfiles.com/files/1168027/77321652078.pdfIn PDF document text
    • https://pigikitukapu.weebly.com/uploads/1/3/4/6/134693564/af0e54aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/julaxel/autocad_2013_64_bit_keygen.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/motorcycle_carburetor_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/xowixewusut.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/computer_bill_format_excel.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_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 5640 bytes
SHA-256: 0c82c9663548dafe976648ff9ff2b0cfd28eac9fd42a2ebb6feadb855f1d129b
font_01_sfnt_off0000f7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 11176 bytes
SHA-256: e3b904675fb0617f3c95c8e5c8ecfd3d6ece3d53636b06b53fca12659e8540e5

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