Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4968175cc2e2d6…

MALICIOUS

PDF

85.2 KB Created: 2021-05-22 09:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6e9d4ff7ba9958be3470bbce36fc59c5 SHA-1: 56d68d4f78bac06f060116ed987dad7414c0c466 SHA-256: 5d4968175cc2e2d646e6af24e0bd061d7aec3acda45558086b5c29da3da1a7d5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as SEO-friendly content, indicating a link farm designed to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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=how+to+audit+sox+compliance PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370072/normal_605b8c675a1a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_603bfd8ce2432.pdfIn PDF document text
    • https://bunonosuvon.weebly.com/uploads/1/3/5/9/135976801/ae7bb65fac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_605028f806dcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390637/normal_605971009f6b6.pdfIn PDF document text
    • https://rewiwuzaziba.weebly.com/uploads/1/3/5/9/135959403/kimatezojor.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/5a084413f573ee6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485572/normal_601a56a5c6d48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492892/normal_5ff6022f9aaef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/can_you_airdrop_android_to_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/narafurenorojaxuretejunit.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/crossword_puzzle_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/reporting_and_recording_accidents_at_work.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/puruzemupipewigifejewu.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/troy_bilt_3000_psi_pressure_washer_parts_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/chicken_biryani_hd_pics.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/fifty_shades_of_grey_movie_book.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/english_academic_word_list.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/esl_family_worksheets_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/15509846690.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_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 5244 bytes
SHA-256: cf82a010c3959dff7beeddff65788acdb1620dea64e0d34fa0131d162100d404
font_01_sfnt_off00012202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12202 11020 bytes
SHA-256: 8dd3ebbf9538df511fa8a87d521365bc0a7d2a6e143823cc93c68d2321b5279c

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