Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c4f1ad91bd0c4f…

MALICIOUS

PDF

77.6 KB Created: 2021-04-25 11:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9c7cf2aa3c93afa5413e248e4c677a0a SHA-1: c8ffcd111cb8b39ba79c67c217c5b8ff6e2703de SHA-256: 79c4f1ad91bd0c4f8a5ccb4a7a4937098626a4aa386c64ffb0fcba1cf25afd50
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'The Divine Comedy movie trailer' and application metadata, likely serving as a lure to direct users to malicious URLs such as https://pelibifir.ru/strik. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://pelibifir.ru/strik?utm_term=the+divine+comedy+movie+trailer PDF link annotation
    • https://nabisafuv.weebly.com/uploads/1/3/1/4/131413222/c649467a.pdfIn PDF document text
    • https://cdn.sqhk.co/kodivitedi/XBhagj2/17083472205.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489032/normal_60622a9684299.pdfIn PDF document text
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/6600953.pdfIn PDF document text
    • http://cosmicgig.com/13605788006q01t.pdfIn PDF document text
    • http://lg-copyright.com/wifanufor1gxyj.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/rih4igg/smart_balance_wheel_hoverboard_battery.pdfIn PDF document text
    • http://leafester.online/xedamijeledefa43uyk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374986/normal_6005065e76439.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/Gjhifjb/wefisar.pdfIn PDF document text
    • https://cdn.sqhk.co/senosekagoko/fihXOO8/jozir.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/iaH7UpX/61284138698.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/8ba1f080-2fbf-4eae-91e8-a69ed2193bbf/drug_reference_book_for_nurses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe6fb728-6516-4c3b-b6fe-a4e63f73b8d7/siripoxoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb66b284-d894-4161-be27-6da0256f2580/bipapudogegotil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a15af49-f2f9-4bd5-b64d-cf0dc259af94/75071361360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67257c69-1f23-4408-91a1-a0998509f717/maximum_normal_stress_theory_for_ductile_materials.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33d2c064-423e-4377-a990-b451ed870a9f/heavenquest_a_pilgrims_progress_full_movie_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd14762c-fc41-4824-a0c4-ab5d77d18a66/tibeleluro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/962968b2-4467-4114-85db-3978d6c0b2e7/introduction_to_cryptography_with_coding_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/146419f5-3aa6-4956-bbd3-04a78010a81d/4016619839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae36bdb2-445d-4325-a332-a1bcf5b4c5a0/89451157373.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_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 5112 bytes
SHA-256: 69a9a8f829ee2f44c580a20f02be3cf59e40eb68e0ec7baf7133db42a553d950
font_01_sfnt_off00010117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 11052 bytes
SHA-256: 7c205b9bf3935f9bad410245a1704315f0a43ed777a1b177a2490b0ff1909153