Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdab04639590876…

MALICIOUS

PDF

77.5 KB Created: 2021-04-06 09:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 73f765b12113302cfd120ba2edbbe1b4 SHA-1: 67df4c31bd8e2f0204f606a97b9dc0a37b4cc02d SHA-256: ccdab04639590876b138a5d005591f8b45f09f1404c83445901927f7fec8b1d9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by both ML classification and ClamAV, with a critical heuristic firing for a link farm. The document contains numerous external links, including one to zajinet.ru and many hosted on disposable domains, suggesting a phishing or SEO manipulation tactic. The presence of multiple PDF links and the use of disposable hosting indicate a likely attempt to distribute malicious content or engage in click fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://zajinet.ru/award?keyword=women+s+bible+study+lessons+pdf PDF link annotation
    • http://reveruverof.medianewsonline.com/dacryocystite_chronique.pdfIn PDF document text
    • https://nefupoxuwuridek.weebly.com/uploads/1/3/4/7/134747690/539ca8.pdfIn PDF document text
    • https://nometoxuf.weebly.com/uploads/1/3/4/2/134266561/jivexemirud_suvozo_maxivi.pdfIn PDF document text
    • http://dasazopemobor.mywebcommunity.org/applied_bioelectricity.pdfIn PDF document text
    • https://tiletemilowa.weebly.com/uploads/1/3/2/7/132710791/barir_jodokodupikatex.pdfIn PDF document text
    • https://wegujelad.weebly.com/uploads/1/3/0/8/130813898/5033276.pdfIn PDF document text
    • https://papuxivosep.weebly.com/uploads/1/3/4/4/134491017/besuvajiviniduwo.pdfIn PDF document text
    • https://momiweporav.weebly.com/uploads/1/3/4/7/134745900/muraxewosurita_tobumiwem.pdfIn PDF document text
    • http://lerinumemikiw.22web.org/envelope_design_template_vector.pdfIn PDF document text
    • https://notetezowinebax.weebly.com/uploads/1/3/6/0/136019470/a8636866cbc8.pdfIn PDF document text
    • https://rogejizerabori.weebly.com/uploads/1/3/4/7/134763318/sagigamejet.pdfIn PDF document text
    • https://pubodepilup.weebly.com/uploads/1/3/1/4/131406337/f217b4d38d77c5.pdfIn PDF document text
    • http://kipivejezijab.iblogger.org/how_to_improve_technical_report_writing.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/56ae34a8-7ece-4609-a720-0552f0723e95/champion_3500_dual_fuel_generator_reviews.pdfIn PDF document text
    • http://lixoledu.rf.gd/44250648980.pdfIn PDF document text
    • http://sudiwoke.epizy.com/financial_management_excel_spreadsheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90616711-e42f-44d8-91ef-3ed034f4300e/45719599368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/313968d6-03d7-48b5-9800-6d4461eebbe2/can_i_cancel_maxcare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/460055b2-334f-484f-bed8-123719d5f312/wixenaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee91a2ac-d2ed-45b2-adcc-83d6fe030037/mares_puck_pro_computer_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5232659-d120-43df-9fd9-5d7ee4b652f1/bowflex_xtreme_2_se_dimensions.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_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 5136 bytes
SHA-256: a4da3c13ff213edec282529f63bdb1a2ec506261323d2d1ed819098fa7fc63e6
font_01_sfnt_off0001043e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043E 10788 bytes
SHA-256: f2a88618d6f2260cd737a91f587c9656dba3e29a628ca17a34281142fafe91ad