Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d894cd6863d8f77…

MALICIOUS

PDF

74.6 KB Created: 2021-03-09 18:31:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d4afaf846a94df184476ee74592179e9 SHA-1: d1ca2ff31651497d9ff0f829f66a077eac216f13 SHA-256: 6d894cd6863d8f7780d8138407f3a302556f90e79a26a5c633c7e8e573d126a6
134 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed for SEO manipulation and potentially phishing. The presence of external URIs and the ML classifier flagging it as malicious strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely masquerading as a legitimate download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://nipisod.ru/strik?utm_term=hp+officejet+advantage+4500+driver+free+download PDF link annotation
    • https://nuralizowipu.weebly.com/uploads/1/3/4/6/134693001/cd5b35ddf.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/kenmore_dehumidifier_35_pint.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/lozetelavagap.pdfIn PDF document text
    • http://wodekenizowa.getenjoyment.net/characters_of_the_story_the_necklace_by_guy_de_maupassant.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/67226821158.pdfIn PDF document text
    • https://gudojovevisepu.weebly.com/uploads/1/3/4/3/134314990/razurotas-buzonibaludulas-pibuxuzisewi-majoxaso.pdfIn PDF document text
    • https://roxagidu.weebly.com/uploads/1/3/4/7/134748987/pelex-fofewupivivavin-kozuwalez-fesavi.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/087d2aad-ecc9-4b2e-a6ce-15c3db424f8b/how_to_cook_chicken_on_lean_mean_fat_grilling_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfcaa3de-f436-4f80-b324-abc3c90ba4f6/pezuzusuzewabereveze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2f5a550-28a0-4866-86f2-e3827121641c/zigejanigibirulofula.pdfIn PDF document text
    • http://visugog.myartsonline.com/bt_home_hub_5_manual.pdfIn PDF document text
    • http://jidagizonan.epizy.com/equivalent_ratios_tables_worksheet.pdfIn PDF document text
    • http://nunejodututote.epizy.com/jaxaxogivawabezali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4afef7af-e5b7-4534-a778-be9912ee022b/what_organisational_structure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/963ddb69-573c-4d63-88c0-099d239ef932/which_thrawn_trilogy_is_better.pdfIn PDF document text
    • http://dojidusajotat.epizy.com/xugegimaburavolusureni.pdfIn PDF document text
    • http://gixomawijal.rf.gd/omron_hj-321_tri-axis_pedometer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fc03079-2975-402a-a9a3-77c2c994d0a8/what_is_the_equation_for_velocity_distance_and_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b47f06c-c96e-421d-873e-db3ea7b3441a/honda_black_max_gcv160_pressure_washer_manual.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_off0000e5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EB 5688 bytes
SHA-256: 87be97d50a71b627adc0e594544c8992ecc1e29a28c9acab96e4745d625c4a85
font_01_sfnt_off0000f989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 10452 bytes
SHA-256: b6ea94d72b91cf2beea53a1173b76c71031a80e57f132bfe88a51ae9a8c28eaf