Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f65d442033b768…

MALICIOUS

PDF

76.7 KB Created: 2021-04-07 15:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f08bc4a6d0e3654300e934e11a96207c SHA-1: 19da6a9255ceb92ea71ad7b0c6aabe9eb03da284 SHA-256: 73f65d442033b7688824891135607763f39515327d1a71b6a54a70eebf6aba6d
154 Risk Score

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 and an invoice-themed 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 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ponafet.ru/123?utm_term=aadhar+card++name+wise PDF link annotation
    • https://cdn.sqhk.co/desixurate/jhzoMib/fepifu.pdfIn PDF document text
    • http://bonboxstudio.com/25739432901ya3pr.pdfIn PDF document text
    • http://alisaborodaenko.design/168694816919twi2.pdfIn PDF document text
    • https://cdn.sqhk.co/gulaxemetila/iofhfje/zawijidoxixitefuboxolizor.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/BifxVO9/alarm_clock_for_heavy_sleepers_walmart.pdfIn PDF document text
    • http://wiinorama.space/61105530826tab21.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/ihhjlEr/ketifam.pdfIn PDF document text
    • http://7evenrp.ru/394110503464bb9v.pdfIn PDF document text
    • http://avbox.org/kimowab3t7k.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/djivjdS/26429001582.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://leragirifodoz.rf.gd/bittorrent_vs_utorrent_speed.pdfIn PDF document text
    • http://kemivitakes.rf.gd/bojimilufedobem.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/tifesem.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/how_to_level_a_grandfather_clock.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/how_to_use_edu_science_telescope_50-600.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 4828 bytes
SHA-256: dd63ec42d7d4dbc0b3a6aa6f758ccc474c3c9e8099d4763018924f55845315d6
font_01_sfnt_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 10504 bytes
SHA-256: 5e467c78c7e8239df18c369999c9cc5fff20d5197b2fae931fa95aeae833d1fd
font_02_sfnt_off0001180e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378