Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a4701fe222dce8…

MALICIOUS

PDF

77.3 KB Created: 2021-02-24 20:20:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6f3d5688ac7438922bda292f052041f7 SHA-1: 684401dd2a3536a2bab91fb3dc26fadbbb70a3d1 SHA-256: 82a4701fe222dce8ca407c36b6a76f914c60789954853257c56c4df28dd99041
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://baarspo.ru/strik?utm_term=reflected+in+you+sylvia+day+summary PDF link annotation
    • https://cdn.sqhk.co/sewujuzanas/r2TUhbw/sewilonenes.pdfIn PDF document text
    • https://sadavofabuloxus.weebly.com/uploads/1/3/5/3/135316226/9730502.pdfIn PDF document text
    • https://bosubunu.weebly.com/uploads/1/3/4/6/134693877/6187142.pdfIn PDF document text
    • https://gikanusubidi.weebly.com/uploads/1/3/4/7/134756500/rabisifuvowuvuf.pdfIn PDF document text
    • https://vifejekim.weebly.com/uploads/1/3/5/3/135322606/zuwivonur.pdfIn PDF document text
    • http://smartline58.ru/how_to_unclog_a_shark_steam_mop3ptdo.pdfIn PDF document text
    • http://axecheat5.xyz/naxuzuramafo70oxu.pdfIn PDF document text
    • https://pewatusikowago.weebly.com/uploads/1/3/2/6/132683224/lefubinasazotaf_bewerataxesizef_jexutapegun.pdfIn PDF document text
    • http://velavedi.iblogger.org/84646997030.pdfIn PDF document text
    • http://tuvexiwegivuke.iblogger.org/how_to_cheat_in_gre_exam.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/dofufiri/adobe_acrobat_reader_pc_app.pdfIn PDF document text
    • http://kimufigekufeta.rf.gd/8931558044.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/lowipetijabetokaguro.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/memu_play_android_emulator_for_pc.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CB 5216 bytes
SHA-256: 2590055fc06a7890b44cb9e993413925e956028375bca9328c87bafcab477381
font_01_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 10688 bytes
SHA-256: 10f17ee16a9296363335aa55956f2012b4e1656b9bb08796dfa173b62944510c
font_02_sfnt_off000119e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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