Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2da7aca4fe66f7f…

MALICIOUS

PDF

77.2 KB Created: 2021-04-08 00:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8520428261076682ef7878c9e157faaf SHA-1: d205868cef3f8d119bf57d50e51704c0d7d6ebb0 SHA-256: d2da7aca4fe66f7ff83a3f7b215c5fe0973c286c637a77299cbe6b2a3d0ec640
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including ML classification, a link farm on disposable hosting, and ClamAV detection as a phishing trojan. The presence of embedded URLs and a 'download button' lure suggests the document aims to trick users into visiting malicious sites. While no scripts were extracted, the overall pattern points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/123?utm_term=iowa+unemployment+wage+reporting
    • http://biolinkus.me/the_expanse_season_4_episode_9_castal3hv.pdf
    • http://voirly.xyz/has_tokyo_ghoul_anime_ended35w4o.pdf
    • http://kzrovk.xyz/13707254513xjovs.pdf
    • http://help-mediasupport.com/fepowoxosezobejulopewaprxs.pdf
    • http://hustlinmoney.com/61118993633584b6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jogekofasi.rf.gd/12373042406.pdf
    • http://fakozavovenabe.rf.gd/50259808297.pdf
    • http://siwebojik.epizy.com/bafufemu.pdf
    • http://wutobonedurovit.rf.gd/nokikomufixorifaki.pdf
    • http://levipazik.epizy.com/3343442197.pdf
    • https://uploads.strikinglycdn.com/files/0c30e0b8-f416-42d4-84ca-d4ef1dc9b748/basic_data_structure_programs_in_java.pdf
    • http://kodeketabekem.epizy.com/55892662938.pdf
    • http://sikujorusa.epizy.com/writing_with_power_grade_11.pdf
    • https://uploads.strikinglycdn.com/files/88538622-695d-4f5e-86cf-8bb408c6b29a/bewozezevikega.pdf
    • http://zebinagapovu.epizy.com/humminbird_859ci_hd_reviews.pdf
    • http://megoger.rf.gd/vilik.pdf
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_f3a957af620d43f6bc57c6838cb27422.pdf?index=true
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_c9cb002bbde949bb99ac2e9b553fe98a.pdf?index=true
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_7b6a83837aec49a493e8fcb8be6e7fad.pdf?index=true
    • 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_off0000edf3.bin
fea90b402b6fbc3adbfb3498753b84d6ce855bb88be3695de8c9f3bcbbd2c32c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 5092 bytes
font_01_sfnt_off0000ff4e.bin
55bd9f67a80e2d184f5e4a21da01c55d9d59efdd3dbfc09538c90932e8371e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4E 11328 bytes

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