Malicious PDF — malware analysis report

Static analysis result for SHA-256 686c911fb461b3ef…

MALICIOUS

PDF

79.8 KB Created: 2021-03-06 02:53:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 75d4199a3b0945231cf342098fb6249c SHA-1: 875b2acbc27dc6837d504922796985d67ecf5e58 SHA-256: 686c911fb461b3ef3ba04617d6f627474029b0211c9da1ed34b2e6f80628b45c
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or redirection scheme, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/wb?keyword=the%20wonderful%20story%20of%20henry%20sugar%20summary PDF link annotation
    • https://xidazujagavoza.weebly.com/uploads/1/3/1/4/131453269/462887.pdfIn PDF document text
    • https://pujezifug.weebly.com/uploads/1/3/0/7/130738771/7990201.pdfIn PDF document text
    • http://premiumpornclips.com/how_to_clean_an_air_o_swiss_humidifierfzav3.pdfIn PDF document text
    • http://tejovotemikodes.getenjoyment.net/5683186953.pdfIn PDF document text
    • http://watogoda.mypressonline.com/where_can_i_find_sat_practice_tests.pdfIn PDF document text
    • http://good-production16.site/migubaxopeborokorikeleviqhl5g.pdfIn PDF document text
    • http://generalmassage.online/warbirds_world_war_ii_combat_aviation_pcgoykw.pdfIn PDF document text
    • https://jazebaza.weebly.com/uploads/1/3/4/6/134662006/3235453.pdfIn PDF document text
    • https://kaxupigokib.weebly.com/uploads/1/3/5/3/135324743/kikitudener.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/active_and_passive_voice_definition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b4cedbc8-f6e4-4c82-a3cc-9bbd154c02ba/30292128347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ba5fdb3-6ccf-4535-be8c-86ea25fa5e38/interview_questions_and_answers_for_freshers_in_bank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7c90088-aa9d-458d-8b1b-d8b9e5510929/pebimilupesagitema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3222ea74-b138-4551-99f4-41210460c406/standard_deviation_introduction_ppt.pdfIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_c24280bdf8d44f15bbea112358a7e0db.pdf?index=trueIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_0d2c6431ce6e488e857bc710784d27b3.pdf?index=trueIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_c2c2e3503a114eff908dc8f27abb08bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c9aca7-2967-47d0-8724-3f246db3210b/nevuwawugorotaxuxaguxope.pdfIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_a4ab98fcd4d84efc9e7c7dd47e063a43.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9628faa3-a7d1-4897-96fa-5dfb1f06c202/what_does_customer_service_assistant_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64f38a79-09bf-4723-b45e-abe65dd4da40/strategy_of_the_lotus_sutra_gosho_explanation.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 5296 bytes
SHA-256: 49c1c822d6d370e336bbc86c6bb2d5a2d3c360415fdb39450d8da7dbdf68d89a
font_01_sfnt_off0000fee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE9 10504 bytes
SHA-256: 0edea2832612b2a333c7b59462b699ef158f32dcd0933e091b563ed5e421afac
font_02_sfnt_off000122ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EF 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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