Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d20309ed11f52ae…

MALICIOUS

PDF

83.0 KB Created: 2021-02-21 00:05:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5d07529fae97f6674e1339eda2f04ee6 SHA-1: 4d7b82242fcfbad77e6858b26bcafb445b2c42f0 SHA-256: 7d20309ed11f52ae86e64fba61648f6f2230dd277695ab505b4f3f313210010d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating a link farm strategy. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent, with multiple links pointing to disposable hosting. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=vba+tutorial+excel PDF link annotation
    • http://6gusevshop.website/miwotuzagowatapenujidohys2r.pdfIn PDF document text
    • https://livakazogoje.weebly.com/uploads/1/3/4/6/134622539/jifurasofebuf_lesazibo_duzirabut_tafixodiruraxi.pdfIn PDF document text
    • http://lovelid.xyz/879371735548bveo.pdfIn PDF document text
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/cabe06c25e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445749/normal_5ff0dd93cb389.pdfIn PDF document text
    • https://cdn.sqhk.co/majatuto/Meih1OD/tetubo.pdfIn PDF document text
    • https://midodelawipage.weebly.com/uploads/1/3/4/5/134585137/ca162df796d16.pdfIn PDF document text
    • https://rojanebe.weebly.com/uploads/1/3/1/6/131637229/5186911.pdfIn PDF document text
    • https://filinisosiwox.weebly.com/uploads/1/3/0/8/130814007/mefev.pdfIn PDF document text
    • https://vopifubuk.weebly.com/uploads/1/3/1/6/131636719/kevefipuzuv.pdfIn PDF document text
    • https://xirazaju.weebly.com/uploads/1/3/4/8/134859293/e4fe9c4bccb85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bodagoge.epizy.com/question_answers_of_no_men_are_foreign.pdfIn PDF document text
    • http://fokuxukidedir.rf.gd/best_android_games_apk_site.pdfIn PDF document text
    • http://venavabumekaj.epizy.com/36122755494.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_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 4788 bytes
SHA-256: 6a6f160155f53cc199e8792942b75e6137edabae4713ef95017c76047342ca8f
font_01_sfnt_off000119d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D1 10968 bytes
SHA-256: d45a7b4c12eb9eea53717028a0a0f5c59b1aac663a793ad791f931d2cfb65d2b

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