Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a81665472f20a21…

MALICIOUS

PDF

124.6 KB Created: 2021-05-10 21:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bddedded508d27de77f7b082c0df3094 SHA-1: 7a9f0f5854c0a7c7b9d0cc9ef305659506575106 SHA-256: 6a81665472f20a2170f31f6d65223c35b21c84a212674fb71b0bfc2a87ffa961
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of embedded external links, with one pointing to 'https://dafemum.ru/strik?utm_term=zoom+505+patches+metal', suggesting a phishing or SEO spam campaign. The presence of numerous links, many pointing to benign-looking PDFs on cloud storage, indicates a potential link farm or redirection scheme.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=zoom+505+patches+metal
    • https://cdn.sqhk.co/pigexebobe/gesPaij/race_for_the_galaxy_playthrough.pdf
    • http://vomoliba.scienceontheweb.net/convertir_de_a_word_online_ocr.pdf
    • http://sk-anker.ru/avaya_one_x_communicator_invalid_parameterbaoo4.pdf
    • https://cdn.sqhk.co/juzurupivepo/ggSRbBL/zelle_phone_number_deleted.pdf
    • http://alcexpress1.xyz/movie_district_13_ultimatumqqyse.pdf
    • https://cdn.sqhk.co/kosaboze/VihdNhf/39449004062.pdf
    • https://cdn.sqhk.co/perikowep/kghtzdZ/bass_booster_pro_apk_revdl.pdf
    • http://kosamaritaj.getenjoyment.net/rodefofefuwimidekolise.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/besafefaf/49917779238.pdf
    • https://uploads.strikinglycdn.com/files/647389c0-b581-482a-a49d-ba0a61069f6c/dupupugoninelokebato.pdf
    • https://uploads.strikinglycdn.com/files/e623bf7b-d942-4398-a4c2-5b40bc780f27/getutufumemuzizavevasi.pdf
    • https://uploads.strikinglycdn.com/files/3ec5e126-1754-4178-b84b-465df12f52c3/70517184153.pdf
    • http://xasejumav.onlinewebshop.net/gusoxudesuvedilolariribax.pdf
    • https://s3.amazonaws.com/kovozenamofox/watch_journey_to_the_center_of_the_earth_online_free_123movies.pdf
    • https://uploads.strikinglycdn.com/files/a06bdf92-4e04-4825-aeeb-be08bf73524f/fugimozanegone.pdf
    • https://s3.amazonaws.com/vedexajawo/65005947717.pdf
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_e2c0dc08db19425d919c18479fe93b4e.pdf?index=true
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_47b56e8488bb492b9ec6f69a4d48ca3e.pdf?index=true
    • http://mixezized.myartsonline.com/diccionario_biblico_mundo_hispano_gratis.pdf
    • https://uploads.strikinglycdn.com/files/10623eba-513d-484a-8890-a3e84abe6bce/best_book_to_learn_visual_basic.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a94c.bin
5e78410fba8a611b388dcfb1e3f60024efddd8557cfa2092ca72ad7b06da0541		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A94C 5300 bytes
font_01_sfnt_off0001bb34.bin
459b239ec1abda12118c55c7db2a6c0c98958d044344ae15cf5333c47d4702cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB34 12384 bytes

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