Malicious PDF — malware analysis report

Static analysis result for SHA-256 949aaf7b73fb79ce…

MALICIOUS

PDF

87.6 KB Created: 2021-04-08 21:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5e3c0e00d997458be71fadbd2c70675a SHA-1: 9ffe24581ad46b02c249f70c445f303250a98f24 SHA-256: 949aaf7b73fb79ce4da25127ccdda18731e87c1e90576d9f1d90ca46c03ffcb3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://druttle.ru/strik?utm_term=the+drawing+of+the+three+audiobook+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380405/normal_604da241436d6.pdfIn PDF document text
    • https://cdn.sqhk.co/texafikogot/eJcvc5H/t_mobile_ceo_contact_number_email.pdfIn PDF document text
    • http://rm-swis-mine.com/31033716325ai2lh.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/jgicbWZ/9562154914.pdfIn PDF document text
    • http://startask.ru/valariralt95pq.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/b2XrAAe/jutidurejarabarerik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501634/normal_60360126f0bfc.pdfIn PDF document text
    • http://pinerapidsrr.com/how_to_learn_periodic_table_fastcxn9x.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/d09cf217-fb00-47d0-bdb0-8f585f2cd8fd/husqvarna_120_mk_ii_review.pdfIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_2834dfcc77864472b81537801238c7c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34bc039-69b6-4ffb-87e9-b0208bc4300c/what_is_stephen_kings_cell_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e188184-63d1-4f56-bc35-90cba7dd4b68/sumunejadixusujebokito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/184e52e2-b1a7-4f5c-a664-1edc6b6a1f84/67124470092.pdfIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_490812cbe372488f897e4bb7be9eeca8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ecec05-fbbb-4218-afb3-826b989f04fd/84604867859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4787da1-97de-4c98-989a-06b0793caa83/personal_carry_on_bag_size_spirit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b77f8c5-e43b-405c-b176-d79d1db35f13/jorutojuvik.pdfIn PDF document text
    • https://72be5e1b-4d14-4335-96ee-88463f604c48.filesusr.com/ugd/57ecfe_709b856d61024f4c80bc7d9a69cb2302.pdf?index=trueIn PDF document text
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_4cbf98a0beb147aaa0ed719f02e139aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/718f2946-2cf7-40d7-ac37-8f49d016b1c2/94100800630.pdfIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_8aee1b83828743d39f38a12d3b278935.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f90ae2c-2b8d-4f2e-8c85-ca56b7f0ea59/how_to_clean_craftsman_lawn_tractor_carburetor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf610cdc-b3ce-4a57-9828-6eb17e85f805/how_to_type_bamini_tamil_font_keyboard.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_off00011823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11823 5236 bytes
SHA-256: 6ecaaaa4d6e79980922cea62f112eb5271814080a1a5e34b9c845a3b48087d37
font_01_sfnt_off00012a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A05 11128 bytes
SHA-256: 7c12db9cebcd1cfb7b1c6f13dac4c741b53d545cb1d764a8da1694045d79b4c7