Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4758a7cc0ebd453…

MALICIOUS

PDF

82.1 KB Created: 2021-02-27 13:03:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 440389dc942493a85310b7f570ed37fc SHA-1: abc2de7d678efcb508981d42ff0f65da307dc43e SHA-256: d4758a7cc0ebd453654521048ebf2a5f2dbf494b87e1fa6207f29ca4472a9552
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection (Pdf.Phishing.Trojan) and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary URL, https://lozipotod.ru/strik?utm_term=sjcam+sj4000+4k+wifi+review, is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://lozipotod.ru/strik?utm_term=sjcam+sj4000+4k+wifi+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501484/normal_5fdafe317d611.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/ihx4jdB/lonedabelizipunuken.pdfIn PDF document text
    • https://cdn.sqhk.co/katutilit/k0fQia3/gomazerukurelodaselaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_6021cbcf7d3e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453327/normal_60275811e830f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486772/normal_600af0c3a9a84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496582/normal_603a135886fc5.pdfIn PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/masixowugosili.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460251/normal_6013b14a2cbf5.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/jdheSgh/jetpack_joyride_world_record_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/tirazirevemu/chegdrq/85949555883.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445864/normal_5fc764f0a507a.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/7ibhfii/45699667908.pdfIn PDF document text
    • https://mokefogo.weebly.com/uploads/1/3/6/0/136086775/wolupoxaxipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426088/normal_600d6a570d84b.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/giihcvx/wawidatemididokilasiwiwer.pdfIn PDF document text
    • https://dutukoviwu.weebly.com/uploads/1/3/0/8/130873875/jebirip.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/fejatepudopito/96129501242.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/43040528918.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_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 5620 bytes
SHA-256: f7869b3f21c902273bd2839db8425daff0f8301f0e9d106c8c3088fcf6f88c3b
font_01_sfnt_off000117f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 10428 bytes
SHA-256: cdea693df801a8827ef13f6c29651224eb5ee1685ae41dc7fa173e775142a8cb

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