Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a6209bcb256868…

MALICIOUS

PDF

75.3 KB Created: 2021-02-25 17:22:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fedfd79097c2d31b88b17ee5e6413a0c SHA-1: 2878dbae23c915065ed1c5ea76932d9000544a22 SHA-256: a1a6209bcb256868d8acfee474aa18f4948497acd296e4bab90358ff7d236871
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on disposable domains, with numerous external URIs pointing to potentially malicious content. The presence of embedded URLs and the nature of the link farm suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jacksth.ru/123?utm_term=agudas+llanas+esdrujulas+sobreesdrujulas+ejemplos PDF link annotation
    • http://zathkatow.xyz/90684187516wqlb4.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/eijEKjb/piano_keys_labeled.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415525/normal_60256d05b2461.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446151/normal_5ff8476322d33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460232/normal_602e290865a95.pdfIn PDF document text
    • http://ogranicbio.fun/how_do_i_check_my_icloud_storage_on_my_ipadj6jft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380691/normal_6033d0177e750.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500665/normal_5ff2829680847.pdfIn PDF document text
    • https://cdn.sqhk.co/somufegojaru/cijf6ji/recargar_diamantes_free_fire_por_id_tigo_money.pdfIn PDF document text
    • http://creditscoreusa.info/5005156006wgatk.pdfIn PDF document text
    • http://detonic-hypertonie.website/webadirezawetikodagon6d3p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_6010fd26e97d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450870/normal_5ff913016c5dd.pdfIn PDF document text
    • http://jakartapro.xyz/54008700669cxi8o.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/fukepez/aquaculture_and_fisheries_management.pdfIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/96484466061.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/16110933386.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_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 5484 bytes
SHA-256: 65b5d99d6861f514ed8cf3a50fc60a67cdeeaa57192e833d09ace04928f98ce7
font_01_sfnt_off0000f7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 12040 bytes
SHA-256: d885e4c31ee02429ece2a88cf8ce9fe8b0a34d5a0baaa8ec357b2d1d03b06256

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