Malicious PDF — malware analysis report

Static analysis result for SHA-256 1108ae12bac215d7…

MALICIOUS

PDF

80.9 KB Created: 2021-03-23 17:12:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e93326c977654f47c0ba5cd8c62069a7 SHA-1: 441fe678774fc32c6cee2fd0ebcd90cda121e583 SHA-256: 1108ae12bac215d7218c50d27b460fa679d1508c35529430fb3d39d39301f234
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gimoguvi.ru/123?utm_term=spreadsheet+software+in+computer PDF link annotation
    • http://jojidasusesot.sportsontheweb.net/sasolov.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/ijhbhdo/rebuild_synonym_and_antonym_games.pdfIn PDF document text
    • https://cdn.sqhk.co/morureju/jaHgcjh/babotinutebujonoxanip.pdfIn PDF document text
    • https://cdn.sqhk.co/vofonowul/ZB0cjbZ/the_impossible_quiz_2_answers_25.pdfIn PDF document text
    • http://tapasin.sportsontheweb.net/vince_advanced_language_practice_3rd_edition.pdfIn PDF document text
    • http://miwasigal.mywebcommunity.org/57003327904.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/d4b5dfab-573f-4571-a917-58d6c27d95fe/vocabulary_workshop_red_book_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce1f2592-ed18-4030-99f8-b5f6c3c94e7e/75067441578.pdfIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_3bf47207e5d54c7488716d492bc4225a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vovuzize/95827227309.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c616e1e-5070-4f00-85b6-7b34a5cdb287/silibipemazupasof.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/bhojpuri_film_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/lavulubamo.pdfIn PDF document text
    • https://78ee58ad-4251-4cb6-9d9e-6f806931ac90.filesusr.com/ugd/b6b4e8_ad33da0b1fff468385f6e1e66c5731ce.pdf?index=trueIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_aa9c5e0506664ad48366475ae1e2f432.pdf?index=trueIn PDF document text
    • http://varirojemixu.myartsonline.com/88635475539.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f909143-adec-4c7c-baca-f4ac53020fa0/what_does_economic_indicators_mean_in_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d8f561a-25ca-438b-9ede-b9778c21e381/79897292906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1041459-cb69-40b9-a517-7cd398ee3513/4_pics_one_word_level_2360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b40486b-2096-4be8-81a3-e3c8489025b4/xatobuwilapupurupizalezap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed96a23-d1c5-43f0-bace-fa99a51d6894/23477619929.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/59028019101.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_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 5440 bytes
SHA-256: 68878b77a50300c594298302e3cb87be3d5e893748e0757d8407592c7a52420d
font_01_sfnt_off0001031f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 10740 bytes
SHA-256: 4659c907ac4698c61b201479a166eb5147e60f9b91da977a3b5779b123096e57
font_02_sfnt_off000127b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e