Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab5a80287cecfa9…

MALICIOUS

PDF

71.0 KB Created: 2021-02-24 14:44:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e3dd8979b64d2f2dfc1b10d8b630e87b SHA-1: 3616a9b5becd715c80451ea22ebb36b399b833d0 SHA-256: bab5a80287cecfa951cd3ef9bf168bcbb537a0f037bae4b56e30d6e53b7bdf85
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/wix?keyword=unlock+her+legs+pdf PDF link annotation
    • https://cdn.sqhk.co/posukomokufi/gfifcib/medieval_kingdom_wars_cheats.pdfIn PDF document text
    • http://tinesoxexi.22web.org/tivawojaxerewonagibevoxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414488/normal_6033c2ac69a47.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/SidSSgc/zombie_gunship_survival_mod_apk_inewkhushi.pdfIn PDF document text
    • http://pipavomiz.iblogger.org/zaxir.pdfIn PDF document text
    • http://noxesim.iblogger.org/maplestory_android_offline_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/B6KhhCX/xopokomininiwotetujowuki.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/ZVPIf77/sword_art_online_ps_vita_games_in_order.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384480/normal_6003a930760e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/wawalupabozifiwom.pdfIn PDF document text
    • http://memajale.epizy.com/58887013725.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/23905465549.pdfIn PDF document text
    • http://reditavipesef.rf.gd/bojte_se_tmy.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/abby_finereader_portable_free.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_off0000d9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AD 5264 bytes
SHA-256: 95e7e3e0e5d741cbf36700c840a64fa7e4816640fd40e6121fe4682fe6c55189
font_01_sfnt_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 10540 bytes
SHA-256: 13e327d65c791f2dc026d35627e171127ce352328a1c9b9df7ec8a31dfea0738

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