Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f86b641601aa1fc…

MALICIOUS

PDF

96.4 KB Created: 2021-03-22 12:31:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7647f35f1412fc849984ba5ee9ec98bc SHA-1: e4118dd55ee9d98c6361906ad040a48af867d3ad SHA-256: 0f86b641601aa1fc85a7786f104f7b37a0fb731dadd67d162b2da2a5c8f01e23
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it is a link farm designed to redirect users to external sites. The primary URL identified, https://nipisod.ru/strik, is associated with a phishing lure related to digital marketing courses. While no scripts were directly extracted, the PDF structure and URL usage strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=digital+marketing+course+price+in+bangalore PDF link annotation
    • https://mixusabap.weebly.com/uploads/1/3/4/0/134096097/1415360.pdfIn PDF document text
    • https://bikafosujikus.weebly.com/uploads/1/3/2/8/132815014/rupisujavul-vomopolobonake.pdfIn PDF document text
    • https://xutekesavugev.weebly.com/uploads/1/3/5/3/135316407/4356846.pdfIn PDF document text
    • http://fajesamosini.sportsontheweb.net/15174668713.pdfIn PDF document text
    • http://jigikujed.scienceontheweb.net/mcsa_certification_study_material.pdfIn PDF document text
    • https://lujututuvaribo.weebly.com/uploads/1/3/4/3/134339905/f170868fe.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/gazitif/detuzigeluvudo.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/wheres_waldo_online_game_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cf57448-a60a-476a-99e6-3ccf2e1b64fd/29618242410.pdfIn PDF document text
    • http://pamubaj.epizy.com/domestic_abuse_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/megolavupixe.pdfIn PDF document text
    • http://nikuzemadol.rf.gd/40759911522.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/18934150780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b74e9cb-c7ed-479e-8229-ef20057724ff/videosecu_ml531be_weight_limit.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_off00013e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0E 5456 bytes
SHA-256: c159827ae3676a9740d8e3fcbd3ec020ba4a5d64b55b41178b547105053f9ee3
font_01_sfnt_off0001508e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1508E 10612 bytes
SHA-256: 92932cf8de0bae480e36e8a54feae018d545c5b2885d08932a7a6b2536758bc2

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