Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8d8bcb4a3c4ed6…

MALICIOUS

PDF

67.6 KB Created: 2020-11-13 02:42:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 97c4172578ef129d96150af6ef9b9ce6 SHA-1: 9267eb9a1288a71819a4cc32c3e2b183fdf78db6 SHA-256: cb8d8bcb4a3c4ed6716364193e9bdb28d06a33c5a4a5355add7d46348c1ec028
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or SEO manipulation scheme. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users 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://traffset.ru/123?utm_term=nightmare+before+christmas+ring PDF link annotation
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/9663994.pdfIn PDF document text
    • https://tipezigixak.weebly.com/uploads/1/3/4/3/134339593/4822904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5fad87102b712.pdfIn PDF document text
    • https://xibedawik.weebly.com/uploads/1/3/4/5/134584063/kodupus.pdfIn PDF document text
    • https://bujupovira.weebly.com/uploads/1/3/4/4/134472582/3699636.pdfIn PDF document text
    • https://teguvubab.weebly.com/uploads/1/3/4/3/134347924/33a1d.pdfIn PDF document text
    • https://rukazoxet.weebly.com/uploads/1/3/4/0/134040508/3809771.pdfIn PDF document text
    • https://malozesa.weebly.com/uploads/1/3/4/5/134505473/gozajiwevured.pdfIn PDF document text
    • https://tadeganerusoza.weebly.com/uploads/1/3/1/4/131438541/gapajubix.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/002d930dca.pdfIn PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/lefegivixepizero.pdfIn PDF document text
    • https://wejakoguxi.weebly.com/uploads/1/3/4/3/134324676/fozukowidudi-wijiduzi-fuvepup.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/fosagoba/answers_to_signing_naturally_unit_8.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/libros_de_instrumentacion_y_control.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/32484304552.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_off0000cc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC41 5372 bytes
SHA-256: 14b2fa7bfcf0c0d827886c75e4f087afa31bac6a15759956fed6b1d2148a3774
font_01_sfnt_off0000de64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE64 10472 bytes
SHA-256: 7252986e4d5f2a82ed59cfab28ea77d271786caa851a35a34ab8d8bfd453fb01

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