Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f21ec6ed4d14d51…

MALICIOUS

PDF

77.1 KB Created: 2021-02-28 00:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a634d982e5693a1f2f527a832526ae85 SHA-1: c3aba0dd4d0bf52def632c50334306646462cd69 SHA-256: 5f21ec6ed4d14d514ef23f5712f50115b6c7c0399f8e1a1dd665a2010077e491
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to a common search query, directing users to external sites. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/123?utm_term=how+many+points+in+scrabble+for+using+all+letters PDF link annotation
    • http://pomirkapa.site/assassin_s_creed_rogue_arno_outfitb4hmj.pdfIn PDF document text
    • http://bimoriz.getenjoyment.net/weketevanazobomisozumir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407062/normal_5fd630e40258e.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/67940173197.pdfIn PDF document text
    • https://wefigofotagovir.weebly.com/uploads/1/3/4/8/134864379/6199704.pdfIn PDF document text
    • http://manovina.mypressonline.com/4907850401.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/short_story_definition.pdfIn PDF document text
    • https://bakijunida.weebly.com/uploads/1/3/2/6/132695635/ce333b90a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500911/normal_60037e161caeb.pdfIn PDF document text
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/saduxikobejokigiko.pdfIn PDF document text
    • http://barashik.space/tabletop_simulator_warhammer_40k_discordonikx.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
    • http://supuwevul.atwebpages.com/how_to_build_muscle_while_burning_fat.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/firasuleka.pdfIn PDF document text
    • http://nowimirozox.atwebpages.com/poulan_pro_5020_chainsaw_spark_plug.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/zokunoredelagepejegapudu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 5512 bytes
SHA-256: cd06156c1b548ecb2868e24da963c7eee8dceec306a5302f85415b0c05c0d74f
font_01_sfnt_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 10932 bytes
SHA-256: b91474d6f775a047e5fad9b2ad4190efafb59176ef04f3601c9aa5e96dc834ce
font_02_sfnt_off0001193c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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