Malicious PDF — malware analysis report

Static analysis result for SHA-256 741c5be07863d0fd…

MALICIOUS

PDF

83.7 KB Created: 2021-03-10 21:48:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 363503f5c9c4d6e112e24af842bbb46d SHA-1: f9d8f4d3bc911d3de4e963af7914afcdbe68e947 SHA-256: 741c5be07863d0fd5aaa5cb2dd7ab3b0d524aa849ba069bc3b1554ec8412a800
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and one primary malicious URL. Heuristics indicate a link farm designed for SEO manipulation, and ClamAV detection confirms it as a phishing trojan. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=hp+designjet+500+service+manual+%25D0%25BD%25D0%25B0+%25D1%2580%25D1%2583%25D1%2581%25D1%2581%25D0%25BA%25D0%25BE%25D0%25BC PDF link annotation
    • https://reponobokuwe.weebly.com/uploads/1/3/5/4/135401207/tizofofakuxudumap.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/english_learning_classes_for_adults_online2iyzz.pdfIn PDF document text
    • https://megogira.weebly.com/uploads/1/3/4/5/134590171/xidinuseje.pdfIn PDF document text
    • https://jobifavizatop.weebly.com/uploads/1/3/4/1/134108852/dubejeriregeluxu.pdfIn PDF document text
    • https://cdn.sqhk.co/garonuvinug/cii8hUC/how_to_draw_hot_wheels_monster_truck.pdfIn PDF document text
    • http://rubyshup.space/tactique_fm_2019_imbattablegrun4.pdfIn PDF document text
    • https://cdn.sqhk.co/pemiduwegam/gciiVS3/kozemubi.pdfIn PDF document text
    • http://stixlife.info/dominican_beauty_salon_open_near_melh5ni.pdfIn PDF document text
    • http://waystep.site/badges_para_imvufzws3.pdfIn PDF document text
    • http://detonic-ufficiale.website/wefamakarif90qbt.pdfIn PDF document text
    • https://cdn.sqhk.co/bidekidarub/gdb0dhg/plants_vs_zombies_cheats_steam.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/5a1da82d-21ad-417f-b2c9-18aeb97cefdd/tiduwaxisabixej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c1a7507-bdb6-49bd-9082-2247af66021f/psalm_23_3_commentary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4740a7f1-a6bc-4f2b-a101-52c33a3b58a0/dalotejukevenoxanugim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a186b80-4ac6-445d-8d5e-72f53a326e88/wendy_nutrition_chili_cheese_fries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e34660-77b5-475d-99e7-3d913e26bc95/67911221206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77421772-a399-48b6-a0c8-13f81a99859e/dixie_chopper_customer_service.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4722e5e0-1e77-45e5-aa2d-e30335458b3d/what_size_ice_axe_for_hiking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6268f39-e7a2-46f7-bec9-c9caa6d851bc/nefizufunusupetawexuxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbef0a8f-f463-46d0-8126-14e7964e723c/which_app_is_best_for_astrology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d17a5aed-4e0b-40c5-a6a5-23373d492608/how_to_reset_la_crosse_clock.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_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 6656 bytes
SHA-256: f1439a780f6f63a15d29684c6046a82d5751172f2fa50bb30794ee141607ab38
font_01_sfnt_off00010b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8E 16296 bytes
SHA-256: 0e5cad65fa0eb996a3975c46d2d9d7ecc4ca1de1100d0f0476b270d1caceffd6