Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd87a0757f40ad5…

MALICIOUS

PDF

74.4 KB Created: 2021-02-25 20:23:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 83dcd02e2b3e2812e6055bc996ebb156 SHA-1: e89292eec02861c4c3735fd9f5249a4a8488022b SHA-256: 0cd87a0757f40ad525303f5399c1d646892035946af7e3508cfb36efa9e78d23
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded URLs pointing to suspicious domains, including one with a UTM parameter suggesting a targeted lure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated as part of a phishing campaign.

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://maypoin.ru/123?utm_term=how+to+be+a+good+leader+in+a+team PDF link annotation
    • http://sowopezamiw.medianewsonline.com/lejexafenuvopejulaxowig.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/exhbvhe/bejeweled_3_classic_online_game_pogo.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzomorikat/diehiij/arkham_horror_card_game_custom_investigators.pdfIn PDF document text
    • https://cdn.sqhk.co/lazimafuxuxi/S6d3icQ/85540303175.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/47531111316.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/vivovejobilew.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/Gujg0oY/78258372247.pdfIn PDF document text
    • https://cdn.sqhk.co/jixuvepabu/jiwxiir/72946852736.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/55686559388.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wovibojo.onlinewebshop.net/why_do_babies_get_fussy_during_leaps.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/bonezat.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/90728993929.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/humana_pharmacy_solutions_audit_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/lazep.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/spell_check_dictionary_failed_google_chrome.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/platform_checkered_vans_red.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/xopowanabivenozaveja.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_off0000e874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 5160 bytes
SHA-256: fa09400f454e97263f5d5c25bbd753e1c25d3a0ffba9fc94770bf34c1dffc41d
font_01_sfnt_off0000f9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 10136 bytes
SHA-256: 95798340b6462d242d439be33b4a1e4ec1fedfa4123c077945f45a36b430029b

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