Malicious PDF — malware analysis report

Static analysis result for SHA-256 4602baad4c175a56…

MALICIOUS

PDF

85.6 KB Created: 2021-04-03 23:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fd34151dac291e78de4c3fab4b7df4bd SHA-1: ae3ffaadc7f002055e912740ad8f77529df0a039 SHA-256: 4602baad4c175a560ed003b98bff44a7f7877ccefa0de3c6f73537415bf8023d
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://dafemum.ru/wix?keyword=amway+business+reference+guide'. Additional heuristics identify the PDF as a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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.
  • 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/wix?keyword=amway+business+reference+guide In PDF document text
    • https://cdn.sqhk.co/kewusikata/Tiajdie/ants_warriors_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/a3Ugd78/21823647552.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/bh4j5rQ/travel_tips_for_zurich_switzerland.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405895/normal_603cfc98e00bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_604467f46451a.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/bhgsJZO/nfl_news_and_rumors_bears.pdfIn PDF document text
    • http://pilizepanaritob.22web.org/how_to_start_a_water_heater_pilot_light.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389582/normal_5fd67f73263fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365575/normal_5fca0b04df955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5fd147a4a55a3.pdfIn PDF document text
    • https://cdn.sqhk.co/mukutosi/cZhj8hh/american_football_games_unblocked_nfl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejabet.epizy.com/can_you_use_turtle_beach_elite_800_on_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/kudikaz.pdfIn PDF document text
    • http://lawedeg.rf.gd/assembler_3_en_un_seul.pdfIn PDF document text
    • http://sapofikij.epizy.com/9793361120.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/82344849834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7b52e50-3557-4171-8564-bc3dc03bb99e/vectors_worksheet_physics_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/44884991109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16fd9a12-86f1-4b20-b59c-d6d8e6195391/31478344654.pdfIn PDF document text
    • http://tubujozuvos.epizy.com/aashiqui_2_full_movie_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcc56195-92d4-4ba0-b766-0da71a3732b2/yamaha_p255_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12bc34cf-bbaa-431f-afb2-04fe3c891480/5478289964.pdfIn PDF document text
    • http://baniginoso.epizy.com/kurominekowa.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_off00010cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDC 5632 bytes
SHA-256: 25674b58041e68e045393f0bbf9498320ce4ab0673245a364ff16aa9bee29123
font_01_sfnt_off0001200c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200C 12008 bytes
SHA-256: c1000a933553687c2c22661c685507acd9482ed19cc0cb28645f984a30c3f7aa