Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12421a0e6b76e92…

MALICIOUS

PDF

98.1 KB Created: 2021-05-27 09:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2981cfcf10f082a5bbe65fdac6e726ec SHA-1: 2318509933bf5f804a3baec12a07965ee288bcc4 SHA-256: a12421a0e6b76e9255e75f52475157f1a50df5303a43043f4ca63fe383f8649c
206 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a callback phishing scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains a large number of external links, many hosted on disposable domains, suggesting an attempt to obscure the primary malicious URL. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm behavior point towards an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=pathfinder+character+sheet+fillable+pdf PDF link annotation
    • https://nugelemuv.weebly.com/uploads/1/3/0/7/130739301/wazidix.pdfIn PDF document text
    • https://gewupokisata.weebly.com/uploads/1/3/4/6/134606569/lulufomeb.pdfIn PDF document text
    • https://sulidisige.weebly.com/uploads/1/3/4/3/134318683/2f38d16dcce.pdfIn PDF document text
    • https://metiganad.weebly.com/uploads/1/3/4/6/134659194/7910951.pdfIn PDF document text
    • https://pewoguliburutoj.weebly.com/uploads/1/3/4/2/134234653/lunefuzogaponulirama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414851/normal_6016fad2ab29f.pdfIn PDF document text
    • https://jefamozalubibul.weebly.com/uploads/1/3/1/4/131438275/3070868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461744/normal_6061bca400363.pdfIn PDF document text
    • https://baxegirugono.weebly.com/uploads/1/3/5/3/135319521/1169953.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/087a54c8-2367-45e4-87a3-ecb9693777e9/integrales_definidas_ejercicios_resueltos_con_raices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d6eef3e-57ae-454c-8edb-a04e33ddd80a/dojupiwotipikinofofibat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee791921-f754-4957-9e35-695e430d8731/72244255196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b783b7b-8b58-460c-b6cd-1f29be78f7fa/how_to_build_a_website_with_wordpress_and_elementor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdc31b67-ab67-44e9-8b22-9f9ab742dd84/como_crear_un_archivo_csv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b98d749-da21-4031-9c36-93c24915656b/cepher_bible_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d77e4f09-736b-412c-8c72-e6d0ca8dfd4a/what_to_do_for_a_clogged_milk_duct_while_breastfeeding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/504a49e7-9507-451c-9f9a-52fa4a85088e/lmites_trigonomtricos_con_cambio_de_variable_ejercicios_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f38ddfbf-c22e-4002-8f39-e3422c651311/26925043731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22034cd2-17ca-4c8b-b5b1-cd1dce9fc582/how_to_calculate_number_of_years_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5178fc7-ee71-448b-86f3-168d93a15dbd/mokoposokusetitinux.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_off00012a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A76 5384 bytes
SHA-256: 08507b79025db7928ad73f3e693540bd0f2fcf6098530a3efabf6f2f7cdf0ebf
font_01_sfnt_off00013cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBB 11944 bytes
SHA-256: 32a75f0055a88f0ccae126a7f0943fd2d85a9f8c7e29e014db30daed2723909d
font_02_sfnt_off000165d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165D7 16140 bytes
SHA-256: 1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d