Malicious PDF — malware analysis report

Static analysis result for SHA-256 098fa8b7af633d3c…

MALICIOUS

PDF

79.9 KB Created: 2021-04-06 04:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7554f6755195947e2663cb26fcca97d9 SHA-1: 885ce4e14fe1aeb4e32a686f4b82e9faba5714be SHA-256: 098fa8b7af633d3c51c53e221785f2b5c19e561ee4d2733cb344dfcfffe3bf98
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links pointing to disposable domains, a common tactic for SEO poisoning and phishing. Heuristics indicate a link farm designed to distribute content or redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The embedded URLs and the nature of the heuristics strongly suggest this document is part of a campaign to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://nipisod.ru/strik?utm_term=model+3+long+range+vs+model+s PDF link annotation
    • http://gudokav.sportsontheweb.net/lomovogu.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/jhr0giK/55739909152.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/higjqhi/797162823.pdfIn PDF document text
    • http://pibakulisup.medianewsonline.com/18658440354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447497/normal_605b8a68a05f6.pdfIn PDF document text
    • https://varepanuror.weebly.com/uploads/1/3/5/3/135394497/wivigafabuvaka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369917/normal_601d85cf8efcc.pdfIn PDF document text
    • https://cdn.sqhk.co/surofowudula/d2Tiecs/92335942766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_602a97f805166.pdfIn PDF document text
    • http://zasazigupat.getenjoyment.net/98152847217.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392649/normal_6005073e498db.pdfIn PDF document text
    • https://divamokavagi.weebly.com/uploads/1/3/4/8/134871471/bolisova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468871/normal_5fe8db02073bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446273/normal_5ff09d8e3260a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407813/normal_600a5c8634a67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xilasisefi/how_does_one_become_a_bar_manager.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/how_to_set_up_a_cobra_radar_detector.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/lunerulutedoraberored.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 5032 bytes
SHA-256: c83ff000354e8511637649a6a35c51c4f98dc88c0e30fc70ff9f868a02c7f06e
font_01_sfnt_off0000fdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 11384 bytes
SHA-256: d5809c9ac615ec4250827836698bddb0332f1919d36580a88896708510b3ef22
font_02_sfnt_off00012483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12483 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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