Malicious PDF — malware analysis report

Static analysis result for SHA-256 dafa319e64f7c2a3…

MALICIOUS

PDF

76.6 KB Created: 2021-03-10 00:02:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 41c2627d7b1b3d656634c838a8159d25 SHA-1: bcf0279c36b63174444825d624c2d8261c0f8ed0 SHA-256: dafa319e64f7c2a3477cbe49c99c3988fb466c71e6d8da50b3fb05a2c2289a8e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are generated for SEO purposes, indicating a link farm or scam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/award?keyword=proper+noun+examples+pdf PDF link annotation
    • http://wotedogupowu.sportsontheweb.net/what_is_brown_vs_board_of_education_1954.pdfIn PDF document text
    • http://zagodutaf.getenjoyment.net/57987489613.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389604/normal_5ffbaf4be9332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_6046c866c6c14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446038/normal_6030995019752.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/tutapaxi/zudepepafomisosa.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/temojukotomowatin.pdfIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_58ca18c1aa5247c095fee09591c256e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/173e1c75-49a7-48ee-965a-844e96004986/5th_grade_go_math_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/30253269087.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/donukojurazoz.pdfIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_734267203c3c42769c96372b52f581be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f76e043-69bc-4eec-8ac4-335070e01898/vanikasejurafuzi.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_4679a39495bc4945a78d95148ea79922.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ea5b888-f00c-4800-ae40-99ac60d58b8b/columbia_contemporary_civilization_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/318f45c0-4a9a-4ece-a213-6a6d19175bb4/what_are_the_differences_between_harry_potter_books_and_movies.pdfIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_7786909f437e4c30b8fb3c0142b07aad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xezonijida/community_acquired_pneumonia_idsa_guidelines_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7cfdce1-f6dc-41bb-8562-77092f426433/literature_a_portable_anthology_4th_edition_gardner_et._al.pdfIn PDF document text
    • http://xijewixevav.onlinewebshop.net/nc_drivers_license_office_hickory_nc.pdfIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_06c644c3127a440b9199a19a5827e46a.pdf?index=trueIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_2e5d87eec2664998ac41125e47c36619.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_a4b8c982c22c41879688ba67487e5a98.pdf?index=trueIn 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_off0000efd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 5256 bytes
SHA-256: a2a5aa07797364f1327b4fcee3c231d6d0ada355dbaf2f920a33033b68dc203f
font_01_sfnt_off000101a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 10376 bytes
SHA-256: 192222d99e1fe3019b61fab2256577266e40f4415e8ef0add2f76b4b0b825eac