Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e625d4dd0990757…

MALICIOUS

PDF

79.6 KB Created: 2021-04-15 15:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ca18ea26b71c64ea81765d51c3dfe34b SHA-1: 71dad7f7654e946d58d240c8d8589c03b403137d SHA-256: 7e625d4dd09907577c34db09617c2e5154fd7a8680638b4693221fa66c2a9c9c
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for SEO poisoning or phishing. One of the primary URLs extracted is https://vilenefex.ru/strik, which is likely used to redirect users to malicious content. The document body appears to be malformed or truncated, but the presence of numerous external links strongly indicates a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/strik?utm_term=how+many+calories+in+a+dunkin+cold+brew+with+caramel PDF link annotation
    • https://cdn.sqhk.co/wetaxawirewu/jcoicAL/christmas_bowling_games_online_free.pdfIn PDF document text
    • http://levantemosaic.com/w3schools_css_position_propertyovzt2.pdfIn PDF document text
    • https://bigorofepomibed.weebly.com/uploads/1/3/4/4/134400252/07ff091926d.pdfIn PDF document text
    • https://farufawajil.weebly.com/uploads/1/3/4/7/134726947/pokofoxupafofe_naxawitibolobe_tosabuxujuvaz_sijurikoje.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/jgjiF2x/shuddering_attacks_definition.pdfIn PDF document text
    • https://nawobelif.weebly.com/uploads/1/3/5/3/135307193/7659729.pdfIn PDF document text
    • http://jekakesefetivap.22web.org/65643695537.pdfIn PDF document text
    • http://tronreserve.online/94759370644c6odg.pdfIn PDF document text
    • http://shoppermarket.online/madonna_truth_or_dare_1991_trailerhvo3p.pdfIn PDF document text
    • https://duvirimak.weebly.com/uploads/1/3/4/6/134603536/gejuvane_zabamokikorimu_zajuvoru_xusogi.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/7e66ae02-304a-4923-8432-805f2e1c0fde/is_there_a_hidden_card_in_the_regular_cards_against_humanity_box.pdfIn PDF document text
    • http://vomepixoj.rf.gd/75448490319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26500d8f-d7dd-4cb4-adff-be050dbc250f/can_tai_chi_help_anxiety.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1662955-3f94-49a2-9454-b06f35be8428/nowax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/569d9d48-c027-4ed4-a4a1-529003a84991/61749858818.pdfIn PDF document text
    • http://tasijojaludet.rf.gd/catriona_gray_question_and_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1466a59f-a173-4117-8e44-f8aa0f4caf75/48064492159.pdfIn PDF document text
    • http://zezatiwo.epizy.com/pegadevipabele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49ce6b0e-69b3-4ea5-bab1-ed7d1be83a45/jquery_cheat_sheet_selector.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/091565f0-85bf-4ae9-be48-6d9394bfb7a6/zajemegenijapowusifimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec8bc63c-4197-4794-844c-71d295697f11/33575820099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d53d73f-d245-4e1a-badb-6577dfd0dbfb/1503701423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf0977df-8c5e-4796-839b-79032f0d0d2b/how_to_practice_english_conversation.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_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 5540 bytes
SHA-256: 0c1e95c861005e3441b7c80a49d20c1dcfdc6913b7e86380afe3477ae2b73b90
font_01_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 11500 bytes
SHA-256: 2d9bb42db4fd14a00af5366a69d50c3c7329a1daa5035b7229c879fc572e9efb

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