Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4ce8ed2e090116…

MALICIOUS

PDF

61.4 KB Created: 2020-12-25 01:41:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d00f8a4478e56891ce619f1605f92172 SHA-1: ec8b25f6d0d5cfafd806725f63f572db3454106c SHA-256: 8e4ce8ed2e0901161a9fbb9e76a91720d5a0ad4e1484b27a31cf530f2aecb4a1
186 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 an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, and the presence of embedded URLs points towards an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/aws?utm_term=bug+report+ea PDF link annotation
    • https://pefolasonej.weebly.com/uploads/1/3/4/9/134901659/2161799.pdfIn PDF document text
    • https://wuzubetimu.weebly.com/uploads/1/3/4/2/134266391/pupevi.pdfIn PDF document text
    • https://xemaxokiba.weebly.com/uploads/1/3/4/3/134350412/gasosadogovogadaxu.pdfIn PDF document text
    • https://gatiwisukebemo.weebly.com/uploads/1/3/1/4/131438587/selax.pdfIn PDF document text
    • https://cdn.sqhk.co/kevejonob/jidDhcl/43654584072.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/govefulikelanew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443371/normal_5fae4c81b506d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_5f975ec112fa6.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/70007d95-3296-4c63-8ac7-e43caca84b3a/kagurakenezepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a0a2c47-6adc-4087-8dbf-85f830727df2/iso_crystal_isles_resource_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/753cbeec-acc7-4a79-9f8d-d41b96813c57/gitavulizeguwisinen.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_off0000b802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB802 4828 bytes
SHA-256: 3f3239c13c3321397f58bf6f20148484229e06da3b8bdd9bc9a58b207de1092b
font_01_sfnt_off0000c882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC882 9708 bytes
SHA-256: 5f6dd35ff8444633f3ed1346de21185ad5ede37036402779ffe294bfdd91123d

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