Malicious PDF — malware analysis report

Static analysis result for SHA-256 b067093f8fb4ebd2…

MALICIOUS

PDF

73.3 KB Created: 2021-02-21 17:43:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 084b45d7ebc8aba17b4979aa29fd6ef6 SHA-1: 0ee0ca3b91af0567bf6efb3905b8daa9dbae4b29 SHA-256: b067093f8fb4ebd2e134f11073368e6f186fb1cfca6b6f89ddfbeeab776068f6
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 numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to learning programming, which is a common tactic for distributing malware or phishing for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wb?keyword=how%20to%20learn%20programming%20javascript PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407064/normal_5fdb99052a999.pdfIn PDF document text
    • http://heleogose.online/ladatulibupipighkpt6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_60209ea013ce5.pdfIn PDF document text
    • http://makeyourself.xyz/83214438109mmn2t.pdfIn PDF document text
    • http://pr-bux.online/pipurabaju9gakg.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/7hjaiaD/twitter_video_downloader_apple_shortcut.pdfIn PDF document text
    • http://spainwow.pro/tebutitegazemarilavijaroxew1j7.pdfIn PDF document text
    • http://pokupka.space/30416351479n8276.pdfIn PDF document text
    • http://francobusiness.com/egregious_eleven_diabetesasq8r.pdfIn PDF document text
    • http://weareanonymous.org/mhw_companion_appir0bh.pdfIn PDF document text
    • http://hugertely.xyz/how_to_downgrade_a_planet_fitness_membershipvqe0c.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/hhhjfpi/samsung_email_app_gmail_push.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bevivose.rf.gd/calculator_gadget_for_windows_xp_free.pdfIn PDF document text
    • http://rosukijabadizi.epizy.com/fleur_de_lis_piano_sheet_music.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_off0000e2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E2 5440 bytes
SHA-256: edaed5432c3226242752ef97b6c9313a10a8404077936100a17d7e7a43271570
font_01_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 10344 bytes
SHA-256: 6e51cb8ac5137f5c40ec03329ee9f506718192894dc54e70f53162f0ef26bc07

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