Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfca77f2c9543d7…

MALICIOUS

PDF

86.0 KB Created: 2021-03-20 00:15:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 690e378f6861067dfc5bbe7ea4651293 SHA-1: 2192a37c8fd803250e34f45151b8665ce93fa635 SHA-256: 4bfca77f2c9543d7f69fb2852f1ee88d1bdda2895cd6f25f4d8c2861bb9fbb3a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains, indicating a link farm designed to distribute traffic. The primary URL, 'https://xezojetit.ru/strik?utm_term=black+and+decker+weed+eater+parts+lowes', suggests a lure related to product searches. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=black+and+decker+weed+eater+parts+lowes PDF link annotation
    • http://texoraw.sportsontheweb.net/blessed_be_the_name_of_the_lord_sheet_music.pdfIn PDF document text
    • http://tuwukadinem.mygamesonline.org/34747378628.pdfIn PDF document text
    • http://funasowuto.getenjoyment.net/cracking_the_sat_by_princeton_review_download.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/calendario_escolar_malaga_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/suzeboxiwo/dHLbWur/lelekonagen.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/pjhaiaa/soccer_heroes_2020_rpg_football_manager.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/b81e3088-7212-444f-aa61-64d32ae2cbfc/18510564610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7136b32e-5f80-4a17-9e25-0bd62a4b8dee/99086545965.pdfIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_79716cf174ae4d0986935fcb61699e5c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bba1e5f2-60f4-459f-a954-40aa2a47193f/womusofowon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82afb0ef-3e67-4ce4-ba38-99887271283c/rokisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19ce90e8-3b5c-4ddd-a860-5a0de08612ce/97159015382.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23e8cdd4-e5e8-4b68-9c35-f23af22b0bd1/22979095099.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/free_game_battle_realms_for_pc.pdfIn PDF document text
    • http://mawokale.myartsonline.com/how_to_teach_main_idea_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/lewaxowoger.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/learning_python_o_reilly.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/consumer_buying_behaviour_research_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d970f8f-9d5d-4130-b886-7876be71530f/how_to_start_a_generac_5500_generator.pdfIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_1704b173c4524bf1abf2fe0ac116c1d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nefagolom/wijojetimeta.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_off00011202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11202 5272 bytes
SHA-256: 892176f4b8dd01ae3eec01313aef23d9facd2c2c12db909c44c382f60ec3287e
font_01_sfnt_off00012411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12411 11336 bytes
SHA-256: 1e6c12cb3db868be2c67338e02d0f9d635eb8df00689bdd0de9ae4ba0220d758