Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c962ae68b9a77b…

MALICIOUS

PDF

72.4 KB Created: 2021-03-26 10:34:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 408a58255b6b4a1f2db1b662ac017b8c SHA-1: 5c58d89e0930281b236b442e8b765b2c85be5cae SHA-256: 44c962ae68b9a77bb9cea1c80180f055116e78311fa3186415295576dd9e53de
252 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics, including a critical finding for a PDF redirector link and a link farm on disposable hosting. The document body, though corrupted, suggests a lure related to 'Assassin's Creed 3 walkthrough pdf download'. The embedded URLs point to known malicious or disposable domains, indicating a phishing or redirection attempt to deliver further malware or scams. No scripts were extracted, but the primary attack pattern involves luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/award?keyword=assassin+s+creed+3+walkthrough+pdf+download In PDF document text
    • http://tamakar.xyz/xojawedikidivopzh92d.pdfIn PDF document text
    • http://fiziwafofekaku.mygamesonline.org/state_bank_demand_draft_form.pdfIn PDF document text
    • http://timurberg.ru/kx_65_price_australiaz6fql.pdfIn PDF document text
    • http://m-laskin.ru/68075807668e3ava.pdfIn PDF document text
    • http://lavkavkusa.store/kagazezozosunevc11r8.pdfIn PDF document text
    • http://pokypka.xyz/honda_transmission_rebuild_manualy8yp1.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/46434280355.pdfIn PDF document text
    • http://bapadama.medianewsonline.com/fetumuxozoxawi.pdfIn PDF document text
    • http://kapusta.pro/vubekuxaduzepejakusomusop07dg.pdfIn PDF document text
    • http://podjem2.club/cuanto_gana_un_juez_en_argentina_2020u8gpn.pdfIn PDF document text
    • http://piredvizhnik.com/bow_tie_pasta_with_spinach_and_cherry_tomatoes2oxmz.pdfIn PDF document text
    • http://kostlike.site/faferubogitalefobap70nic.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/abcf925f-fcef-4aea-a08f-95bf6fd85073/the_top_five_regrets_of_the_dying_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b85de9f3-44b3-4d0f-9d70-ce52e16b5024/lavokadibaxobunuxatisut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d593d39-057b-49cd-9f7e-c44835a64a26/can_civilians_wear_military_clothing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1032d3ca-e54b-4c58-b997-edf1229da21f/lagoxifizepigimokevew.pdfIn PDF document text
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_be5d844e76254d268028d943732e0c7c.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_5f4a164ed20d480e922ba6f634a69d8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a723ad97-b3b6-46bf-9782-1e421164cb6a/adele_25_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80775477-9ce7-4d68-9a24-3cf4faed048d/favivuvurutepomefaxoranas.pdfIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_e08a19ddd9a74408ad3be3ea1ea57709.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fbf2e08-9e60-4d42-81ef-6c4271a26050/gopajivoxudivogiweniposon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c2ba236-4153-48ba-9cfe-8ca18fdce5cd/the_odyssey_study_questions_answer_key.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_f27d5afbf6b4444787ec20e2d2719163.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/124b04f9-37ab-4234-a5ed-9a1a64e6508b/nikon_dx_vs_fx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62adcfdd-e4bd-407b-9fd6-d88812583912/what_internet_speed_do_you_need_to_run_zoom.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_off0000dc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4C 5724 bytes
SHA-256: 6397cd47c5f0098e150e7c381c8c9ce3b140fa32d777c932ee0953c162cf0305
font_01_sfnt_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 10608 bytes
SHA-256: dd9b2292391f0fffefae34d65270cea839965cd874aa377834af35a96aa4032f