Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd39769c51082a5b…

MALICIOUS

PDF

78.7 KB Created: 2021-04-23 02:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6a822ea6452b43a5b92cf50e6ab4e0a SHA-1: b8aa7c877428264faacc4413177cdded60e9c468 SHA-256: cd39769c51082a5b4c7487d96f31944d52be1ed9cf00bd0be961ce3b1ee2e63c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs that point to disposable domains, characteristic of a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the document's primary purpose is to host these deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/strik?utm_term=price+of+bowflex+ultimate
    • http://winwites.space/eberron_campaign_setting_3.58iiy5.pdf
    • https://cdn-cms.f-static.net/uploads/4467955/normal_600ce6e579dc0.pdf
    • http://berefiruzo.mygamesonline.org/30495800379.pdf
    • http://oficialshoes.site/how_to_reset_jvc_unit_bluetooth0sj52.pdf
    • http://subuxiwubemew.getenjoyment.net/foxit_reader_for_android.pdf
    • http://zootime.store/pubimumawazakirabaz5fg48.pdf
    • https://cdn-cms.f-static.net/uploads/4366011/normal_6012e071b3fed.pdf
    • https://cdn-cms.f-static.net/uploads/4423780/normal_601aa9413b8d6.pdf
    • http://twirlini.com/free_ringtones_for_iphone_7_without_itunesi0f7a.pdf
    • https://cdn-cms.f-static.net/uploads/4408992/normal_606dd23955e42.pdf
    • https://tujupanex.weebly.com/uploads/1/3/5/3/135333196/348ccc27882a4da.pdf
    • https://sifejolo.weebly.com/uploads/1/3/1/4/131410009/82129bd5.pdf
    • https://zufulakoloti.weebly.com/uploads/1/3/5/3/135301661/ketutoneg.pdf
    • http://fadulifakibul.medianewsonline.com/statistics_and_data_analysis_from_elementary_to_intermediate_tamhane.pdf
    • https://lonapumerupa.weebly.com/uploads/1/3/4/8/134853684/kolegelutuwaruxinume.pdf
    • http://sixesijilolun.mywebcommunity.org/83525797487.pdf
    • http://sreda.city/lujowebawizowararh1pp.pdf
    • https://cdn-cms.f-static.net/uploads/4413239/normal_602055b4e2c74.pdf
    • https://nikudedixipapun.weebly.com/uploads/1/3/4/6/134692686/pufasedamomud.pdf
    • http://xitodefigatefuj.medianewsonline.com/thermo_scientific_lindberg_blue_m_water_bath.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pulavokaxe/annex_14_icao_free.pdf
    • https://s3.amazonaws.com/gekixadonuru/xubobavo.pdf
    • https://s3.amazonaws.com/zeworibuzoza/57751591458.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f531.bin
dc0e61735e075fd86cbb45a4cb8eacf8490f20e7bc81ef21fc1d4b9ad747811b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 5148 bytes
font_01_sfnt_off000106b8.bin
aea4d99bd013fa231f743a7694724202ba1b11e28a4d0215a178e9c06c4ac89d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 11400 bytes

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