Malicious PDF — malware analysis report

Static analysis result for SHA-256 855074ab7e3ceea6…

MALICIOUS

PDF

80.1 KB Created: 2021-03-17 23:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67ceae585e19788d18bcf148e816e50e SHA-1: bce98f12426360bc3c4ba63742606ecb047a1097 SHA-256: 855074ab7e3ceea67e639607f3c6b153d7739b1cac4087af4a35f1450f12af07
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files with SEO-optimized titles. This behavior is indicative of a link farm, often used to manipulate search engine rankings or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=art+of+merlot+events
    • http://pelubexeto.getenjoyment.net/wonky_donkey_book_free.pdf
    • http://pexawegowe.mywebcommunity.org/artculo_de_opinion.pdf
    • https://dosisusibifoba.weebly.com/uploads/1/3/4/2/134236234/pigevolev.pdf
    • https://cdn.sqhk.co/naxibibu/YigDhgw/tiny_voices_bad_religion_letra.pdf
    • http://gagitevanonuti.mywebcommunity.org/ashrae_handbook_free_download.pdf
    • https://cdn.sqhk.co/duxivutunum/KighibE/fiwugakodojidafiwikifep.pdf
    • http://nizavevorupuj.mywebcommunity.org/how_to_start_learn_chinese_language.pdf
    • http://tomokatixo.mygamesonline.org/number_flashcards_printable_1-200.pdf
    • https://cdn.sqhk.co/jasurisunav/thbSfhe/safajetuz.pdf
    • https://kisupumusu.weebly.com/uploads/1/3/4/5/134513531/zovigigaf.pdf
    • https://cdn.sqhk.co/baziwuwe/vrhd8hf/zajowugelaxofagim.pdf
    • https://cdn.sqhk.co/terupilenu/ijjPwRz/kakifonulakaxakivudi.pdf
    • https://reravojune.weebly.com/uploads/1/3/1/4/131406269/a1e2333772a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6e6965d1-c3f2-45f2-94d7-e35301cc61de/how_many_different_tie_knots_are_there.pdf
    • https://uploads.strikinglycdn.com/files/26c91383-fe4f-4736-881c-846c8fb54ca7/what_is_understanding_in_the_bible.pdf
    • https://uploads.strikinglycdn.com/files/dfbe6618-f180-46db-aabb-fc863ec686c8/77146789002.pdf
    • https://uploads.strikinglycdn.com/files/825c2a65-3ecc-499b-9743-f7a1826749c7/nikon_af-s_dx_vr_zoom-nikkor_55-200mm_compatibility.pdf
    • http://vutogebufuz.myartsonline.com/common_interview_questions_and_answers_for_managers.pdf
    • https://uploads.strikinglycdn.com/files/6b2f5a44-ce71-4c2f-a5fc-43d4b1c84df7/microbiology_textbook_for_mbbs.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e679.bin
40b07239966be9c129a5c2b28704b532b1013f50866a16c5d1be57bfdad2c983		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE679 4752 bytes
font_01_sfnt_off0000f696.bin
47067108f130d29dc5cb5926c85cb277999ff02978f6ef4a6fcff4fd02b51d39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 11372 bytes
font_02_sfnt_off00011d05.bin
3bb08857b08983a257d5a2052628e18542fd51c8d29f5bbef87ea8b8ace00841		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D05 16096 bytes

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