Malicious PDF — malware analysis report

Static analysis result for SHA-256 82516edb3907a398…

MALICIOUS

PDF

76.2 KB Created: 2021-02-12 15:02:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7e5760b6818d5aaadbc3472faa98871e SHA-1: d81dace0a46fb27472bb1d611d8910e892f83113 SHA-256: 82516edb3907a398fd735142029ab2da70b62e7fabe68fad9b961272a74a1072
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with several pointing to disposable hosting and identified as part of a link farm, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this attack pattern.

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 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://druttle.ru/wix?keyword=letter+u+arts+and+crafts+for+preschoolers PDF link annotation
    • http://tesocoin.online/android_device_manager_forgot_passwordsk37d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471948/normal_6019d836202f3.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/g0ahhEz/best_free_tv_apps_uk.pdfIn PDF document text
    • http://gejekixevase.22web.org/87166048423.pdfIn PDF document text
    • https://cdn.sqhk.co/renonidofel/Lgdnj89/43142296475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457330/normal_601dd0c06f760.pdfIn PDF document text
    • http://losewunisa.22web.org/gagikuwapotibus.pdfIn PDF document text
    • http://tanifulumu.iblogger.org/pelotixosof.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/hiyjcjb/75199208728.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jegegapi.rf.gd/roxezerovevolanuluja.pdfIn PDF document text
    • http://juzelipa.rf.gd/marshall_major_3_bluetooth_guide.pdfIn PDF document text
    • http://nakepusejedub.epizy.com/42087197985.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_off0000ef04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 5184 bytes
SHA-256: 3ebcf7070158df01912dca3ee6c538767c603067ca920815a3efac10db94821b
font_01_sfnt_off000100a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A5 10184 bytes
SHA-256: 9604acd1bb3cd0bfb388e780764af80723a5d2927e555aa555b5b1fbba5b8d6d

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