Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ddce5e3a5587fa8…

MALICIOUS

PDF

93.2 KB Created: 2021-03-18 01:03:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fad3995cfa389923ec9a0f72b70335db SHA-1: b4a1eb515b3ffb8b3666db4d74e028b8f49f9a7d SHA-256: 6ddce5e3a5587fa806fd5b09a0ad2f73dabdde2696abb7aeabf5470eb16bdcfc
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 are SEO-optimized and point to potentially malicious domains, including 'pelibifir.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=auvio+bluetooth+headphones
    • https://cdn.sqhk.co/gorokipo/ibgibjg/bahubali_the_game_hack_mod_apk_download.pdf
    • https://cdn-cms.f-static.net/uploads/4383565/normal_5fd267ab80b15.pdf
    • https://cdn.sqhk.co/mekerijiwuv/jeNOI4B/elektrometal_plus_metal_prices_new_jersey.pdf
    • https://cdn.sqhk.co/letijefa/hijf0hi/latigo_definicion_en_ingles.pdf
    • https://cdn.sqhk.co/devisojop/hcgesSK/free_printable_kitten_birthday_cards_for_wife.pdf
    • https://static.s123-cdn-static.com/uploads/4369191/normal_5ff1e11184443.pdf
    • https://static.s123-cdn-static.com/uploads/4485929/normal_60017d84060fc.pdf
    • https://cdn-cms.f-static.net/uploads/4469106/normal_601ddeb30f0be.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/batoragubukepo/my_first_grammar_book_1.pdf
    • https://s3.amazonaws.com/tuxexi/timakivexijibo.pdf
    • https://uploads.strikinglycdn.com/files/63a5a5cf-04c5-4fde-b409-66a01f162ecb/how_to_make_homemade_breakfast_bars.pdf
    • https://uploads.strikinglycdn.com/files/791a12f2-1c14-46fd-b538-b7c1dd02b572/prohibido_enamorarse_de_adam_walker_epub.pdf
    • https://uploads.strikinglycdn.com/files/84915f44-175b-4d8c-af33-1efe1244d79b/critical_analysis_essay_introduction_sample.pdf
    • https://uploads.strikinglycdn.com/files/c9493cf0-fc40-4c4e-9306-0939e574999c/how_to_work_out_angles_of_a_scalene_triangle.pdf
    • https://s3.amazonaws.com/jivagajamav/list_of_automobile_industry_in_pune.pdf
    • https://s3.amazonaws.com/fopalew/asmaul_husna_lengkap_dengan_artinya.pdf
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_99e5ed218ca04f37bd8f83db66263f5f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7bb94def-da3d-4244-b362-206ac525f411/67663166504.pdf
    • https://uploads.strikinglycdn.com/files/c42643b7-78aa-407f-b140-e6a9603eb40b/84702532960.pdf
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_cb4e154ba1c9480dada60819f83382ea.pdf?index=true
    • https://3ea853e4-7f2b-4fb0-9229-b04907a1e321.filesusr.com/ugd/d94095_56e031f7b01a4b3088a096a0b141ec18.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d446da1a-ccff-4274-b273-1cb49d423981/feldman_r._2020._4th_edition._life_span_development_a_topical_approach.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_off00012cf7.bin
42a2ba09942122f03e48d36564451808c8e29cb6f741fed997c86c1499f782f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF7 5140 bytes
font_01_sfnt_off00013e70.bin
f65d6067388ea531cca4bc4fdd727ff34a4749c2d5e1055a96eb2dcd183b4f5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E70 11760 bytes

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