Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3a68f4df9291a2…

MALICIOUS

PDF

69.3 KB Created: 2021-03-04 13:34:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 595297aae5849a487520b534224f3541 SHA-1: 496360a6c4bb8a10e644c6ea8ef1e64314b2428f SHA-256: 5f3a68f4df9291a27b332c80a8a26f3c82deaeef1492cc7441bd4093e7d2df42
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/123?utm_term=connecting+backbeat+fit+headphones
    • https://cdn.sqhk.co/lagidexetin/o4hhhig/game_of_thrones_sticker_whatsapp_iphone.pdf
    • http://gajonedorebuko.mywebcommunity.org/73318700739.pdf
    • https://cdn.sqhk.co/zimidenex/giBUrgj/92961510618.pdf
    • https://koruguliduni.weebly.com/uploads/1/3/4/8/134896859/9085900.pdf
    • https://cdn.sqhk.co/jifigetuxu/gfFeicX/zavidevumakuworepazerew.pdf
    • https://cdn.sqhk.co/zolewiko/Ynghigz/28506855208.pdf
    • https://cdn.sqhk.co/tubadaluzafu/ifYvKjh/lezudezudaputojidatoj.pdf
    • http://pidagenavuziw.mywebcommunity.org/mamuzagiguvorufopafojuji.pdf
    • https://cdn.sqhk.co/xuwolegu/jjbn8ib/jixajegivivowudigetotomom.pdf
    • https://cdn.sqhk.co/kefesizo/j7icjdw/hp_smart_app_for_apple.pdf
    • https://kiwotatuna.weebly.com/uploads/1/3/1/8/131856308/siwakidoz-meranometotep-pafuxomokak-serafubebevaf.pdf
    • https://cdn.sqhk.co/mewuxedodi/JDqfghl/sewudelutekaxipotisij.pdf
    • https://cdn.sqhk.co/wobuwozavenu/jggZghC/birthday_cake_decoration_with_fruits.pdf
    • https://cdn.sqhk.co/nalujujoso/Z3IfxX2/fapusarodox.pdf
    • http://xafesuvorolivig.scienceontheweb.net/bosch_ascenta_reviews.pdf
    • https://cdn.sqhk.co/pagupuxu/jiighin/53089949436.pdf
    • https://muzikalojex.weebly.com/uploads/1/3/4/0/134012647/zakuwa-gotejewinilujen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b2964934-9197-4448-a13a-211c6948e4f0/how_to_service_a_singer_treadle_sewing_machine.pdf
    • https://uploads.strikinglycdn.com/files/b4418371-bbb4-46c6-afc9-66cefbf74d5f/how_much_do_you_make_at_starbucks_an_hour.pdf
    • https://uploads.strikinglycdn.com/files/8366de1c-a4ec-4b7d-923d-841ecebd8afa/kiss_the_rainbow_return_policy.pdf
    • https://uploads.strikinglycdn.com/files/f6d2257b-e22b-4893-a636-4980c2554817/galaxy_s9_plus_charging_cable.pdf
    • https://uploads.strikinglycdn.com/files/152ec58e-ab8f-4fa9-b74e-cf48dfb4df68/49496393320.pdf
    • http://kaloruligot.onlinewebshop.net/22717432352.pdf
    • http://tososite.onlinewebshop.net/wutoraxonevavi.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_off0000d28c.bin
0f85e27de664164bbc18b5811defaea8be680339cf7a00f51241295b73545acd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD28C 5396 bytes
font_01_sfnt_off0000e4ee.bin
b4a86a208110d659eceeae6ce6e459fb52a7702d09ed7589b892edb4db8e5ac0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EE 10112 bytes

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