Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a51ecb928a972a0…

MALICIOUS

PDF

70.2 KB Created: 2020-12-15 03:00:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c667b3b1dacc35157329162a219822ec SHA-1: 330a0ae27af4d2b2ff828b84b3bf498b6cb80dc3 SHA-256: 1a51ecb928a972a08c7b697ed4e300fb25b3517e7fe9a12a8603a19de3ef1fc8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://trafffe.ru/123?utm_term=ffxiv+astragalos+guide', is likely part of the malicious infrastructure. The document body is heavily obfuscated and unreadable, but the presence of numerous external links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=ffxiv+astragalos+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445557/normal_5fa0d6e02c809.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/bosopajeburat.pdfIn PDF document text
    • https://jebapawobukil.weebly.com/uploads/1/3/4/5/134521284/kalovolowazubat-pejitagusewasa.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/b94e1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482880/normal_5fc3d9ed67e80.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/wewiro/easy_english_test_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/548e4431-ee21-40e0-8305-1dbcb6d68e43/32381934463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00df8772-3eac-4a00-9986-e643f1648166/47116589154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef8b8cf2-7c38-4127-a304-70f7092648fe/bivupezajasonazamuv.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3a46c8139af037656512a/t/5fcc00a1f94b6402b2056516/1607205025364/10381436094.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/xisetinusunomuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb3136d0-c1ff-4843-99eb-8ab97ed26fdf/fadiw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc659750a2757459b082a1f/t/5fcec55455629615613e8beb/1607386453681/vigigepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ad72491-5b75-4dca-a341-785d9b569a04/gojezaxajuzaletorut.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/34666514542.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/chikni_chameli_audio_song_masstamilan.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_off0000d73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73D 5156 bytes
SHA-256: c0ac4796a48da539443b57f16dfa6fd470a71a81894720658aa7b8b3deb3e193
font_01_sfnt_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 10312 bytes
SHA-256: e2ce97912be73d59a5e5e411b1f121f3090a7ddc8a7362a0f709a0f99f49a4c5

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