Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a91b09b452175bb…

MALICIOUS

PDF

79.9 KB Created: 2021-02-14 06:11:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2c71a179040ac5e0cf5385a1a6a12a91 SHA-1: b21a0545378a0e27acf17f9cbe826c5986af845e SHA-256: 6a91b09b452175bbfece194c9ad4fe93cde8bc55db4751bd1e72a541899c840a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to 'bologen.ru' and containing 'utm_term=emulator+zone+roms', suggesting a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is a link farm on disposable hosting, reinforcing the phishing or malware distribution intent. ClamAV detection as 'Pdf.Phishing.Trojan' further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/123?utm_term=emulator+zone+roms PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404987/normal_5ff54587e820a.pdfIn PDF document text
    • https://sajogosekatoja.weebly.com/uploads/1/3/4/6/134682383/dedinojufozo.pdfIn PDF document text
    • http://vojituvidur.iblogger.org/86505989512.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480598/normal_6006b29b5ebcb.pdfIn PDF document text
    • http://begamigojas.iblogger.org/movie_script_template_microsoft_word.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_601728dc7ab32.pdfIn PDF document text
    • https://nilesezijifata.weebly.com/uploads/1/3/4/8/134885493/nanozuse.pdfIn PDF document text
    • https://jazebaza.weebly.com/uploads/1/3/4/6/134662006/banepuz_semafebodil_meboxuma.pdfIn PDF document text
    • https://dafebifu.weebly.com/uploads/1/3/4/3/134399244/8826473.pdfIn PDF document text
    • http://kalewolasufer.22web.org/64018835632.pdfIn PDF document text
    • https://fogunovavak.weebly.com/uploads/1/3/2/6/132681822/jezozo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459482/normal_5fe7ac9431861.pdfIn PDF document text
    • https://banatili.weebly.com/uploads/1/3/5/3/135314160/zaxasegusu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wafidifu.rf.gd/61877092122.pdfIn PDF document text
    • http://dizogusuvi.rf.gd/tejez.pdfIn PDF document text
    • http://mitefunigesito.rf.gd/96186122262.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/ultimate_starter_kit_for_arduino.pdfIn PDF document text
    • http://dufobilubaxa.rf.gd/kindergarten_worksheets_reading.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/15532380959.pdfIn PDF document text
    • http://kuwademepekipil.epizy.com/xizakerowo.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_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 4840 bytes
SHA-256: 210cb3d1cf527b84361fdc1090aa6bfa0c188f5b95d12b7527a500d651456aa5
font_01_sfnt_off00010d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D75 10924 bytes
SHA-256: 8dbc5fbb2557fe84b06498bfbdb1ba38092819837ed590a24d1c04eddb011c80

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