Malicious PDF — malware analysis report

Static analysis result for SHA-256 593721e88f88a1ba…

MALICIOUS

PDF

86.5 KB Created: 2021-04-07 06:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5be0ac395980edb29b6473462d345fb3 SHA-1: 59c77bfde874330e1386556248a9a0ab5af59288 SHA-256: 593721e88f88a1ba0ff5a1339c689443a907fd432030b30e63673536e5856bb9
206 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. 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/award?keyword=canara+bank+credit+card+application+form+download+pdf PDF link annotation
    • https://sekikeke.weebly.com/uploads/1/3/4/7/134739811/7293954.pdfIn PDF document text
    • https://pibefugaradaxo.weebly.com/uploads/1/3/1/3/131398186/zawime.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/JifWTqs/spanish_learning_book_download.pdfIn PDF document text
    • http://cardioactiveitalia.site/resident_evil_revelations_jill_costumesz8h46.pdfIn PDF document text
    • https://sivevaredewiw.weebly.com/uploads/1/3/4/4/134464028/gagome_mutug_meditakumefida_reselup.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/what_does_service_due_soon_b_meannrym4.pdfIn PDF document text
    • https://jorevubo.weebly.com/uploads/1/3/4/8/134869484/4590848.pdfIn PDF document text
    • https://wuwesojelure.weebly.com/uploads/1/3/5/9/135973580/7286507d0a.pdfIn PDF document text
    • https://gesegalug.weebly.com/uploads/1/3/3/9/133999779/lunisalasu.pdfIn PDF document text
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/521d226.pdfIn PDF document text
    • https://cdn.sqhk.co/terodekijur/ajbjbP4/rawinun.pdfIn PDF document text
    • https://jazafojof.weebly.com/uploads/1/3/4/3/134310209/dc87e03503af00.pdfIn PDF document text
    • https://popupobapovuzus.weebly.com/uploads/1/3/4/0/134012290/76a419.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/WvS0Ojf/beginners_guide_to_investing_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6596cf3a-4bce-421e-ad50-8b18366f18d7/how_often_should_i_change_my_transmission_fluid_nissan_altima.pdfIn PDF document text
    • http://tisevor.rf.gd/fopej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ba84a53-4963-491e-8282-2e9aa4ae3b55/gukajude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42acb4a9-be29-46c9-b10c-2a1a9dffaee8/how_to_build_core_strength_for_climbing.pdfIn PDF document text
    • http://savadowazox.rf.gd/stihl_string_trimmer_comparison.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 5324 bytes
SHA-256: f0121447ef17245bf188171ca58c59a0795f8f91ad88dc4639a9a81048a5d4e9
font_01_sfnt_off00010fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 11444 bytes
SHA-256: 42bf96bd8e1c238c0ec7323b22ca404406786b2c4c3962afd1bf767f8b140be2
font_02_sfnt_off00013704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13704 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3