Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f50eea5b328a39…

MALICIOUS

PDF

79.3 KB Created: 2021-02-26 22:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cdd2c25bcf29fc462b652637f86988f0 SHA-1: 9af3d384109aabd45b6644b192f61efb102d1e83 SHA-256: 85f50eea5b328a395130f0619bce6a9364de04bf73bd3e93e6b8480035b35178
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://vilenefex.ru/wix?keyword=lego+cafe+corner+for+sale PDF link annotation
    • http://inertbhjbj.ru/levadurozivozufodeveu93u.pdfIn PDF document text
    • https://cdn.sqhk.co/taxodisilif/hgegH4h/dominos_pizza_near_me_delivery_number.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417129/normal_600301bcaab1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_60378c72e4631.pdfIn PDF document text
    • http://raisinshq.pro/themes_in_jazz_by_toni_morrisonrvxfm.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/MtjhOhc/pemumamevexipalaxasuseme.pdfIn PDF document text
    • http://optarfes.com/718618740390nsbv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489041/normal_5fddce5960210.pdfIn PDF document text
    • http://vepozatab.22web.org/allu_arjun_all_movie_songs_ing_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/b2shb8u/amazon_a_to_z_password_reset_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/sedasolegov/jggjaic/move_to_sd_card_greyed_out_samsung_tablet.pdfIn PDF document text
    • http://cashbackmoney.info/polujatazadakanaso5clyc.pdfIn PDF document text
    • http://leadtop.co/moviesda_2009_tamil_movieon0hv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464303/normal_5fe673a9737ef.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/zesotat/counter_strike_terrorist_shooting_mod_apk.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_off0000f9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 4988 bytes
SHA-256: 9faaccad2a89164a5af7ae31558bd0e1556cff82dcac95d67e9b11c270af55b1
font_01_sfnt_off00010b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 10756 bytes
SHA-256: 1de2526cd4ddb0f08eca3c6999c10561bcc5ff97cdeb86408a51fef925f3d0f9

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