Malicious PDF — malware analysis report

Static analysis result for SHA-256 097cb1d6f4f12b4b…

MALICIOUS

PDF

69.2 KB Created: 2021-02-20 21:13:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8cff5b399438e1f6261b15c69cfd60bf SHA-1: dcc400ed50e4c43c279b0e21e81d0b308f56fb9d SHA-256: 097cb1d6f4f12b4be21125e598c04e349a0be1cfb321884c09a912eb547d18c0
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable domains and link farms, indicating a strong intent to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of these links, suggesting a tactic to obscure the final malicious destination.

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://jottigo.ru/strik?utm_term=how+can+plant+cells+store+the+sugar+that+is+produced+in+photosynthesis PDF link annotation
    • http://rte-ita.fun/71402280162kurhq.pdfIn PDF document text
    • http://inmyshtangen.xyz/mefabenidudemazuboze6sdzy.pdfIn PDF document text
    • https://dexovepiniputo.weebly.com/uploads/1/3/4/4/134400909/3749437.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/gjogiid/marketplace_foods_hayward_wi.pdfIn PDF document text
    • https://molesomux.weebly.com/uploads/1/3/2/6/132681378/sazoken_jetimofavufap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_602431c2a1d1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500446/normal_6010b6287e0a3.pdfIn PDF document text
    • https://cdn.sqhk.co/pibutuvopedu/jbjbuge/descargar_partidazos_play_futbol_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/sisuriwul/ggFjbhe/spades_scoring_sheet.pdfIn PDF document text
    • http://anarchymedya.com/emergency_evacuation_plan_templates8mgqa.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/sisixeguwas.pdfIn PDF document text
    • http://slimerecipe.org/wilamajivokojejuneokoyr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD188 5488 bytes
SHA-256: 26122883b1c8ef9674a39b4004f5769b07f08f98c9b761b7609667618958c357
font_01_sfnt_off0000e441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE441 10204 bytes
SHA-256: 1605d9bea6e2bf002749415238883b2651adeac4898d75fa46f117df3d60ed04

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