Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d0374f7253a576…

MALICIOUS

PDF

71.3 KB Created: 2021-04-25 02:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1a5a946a9924901b9cf938b2d9e4a498 SHA-1: 1a6fec65019daf63ce5673bcae06a9168459b70f SHA-256: d7d0374f7253a5765590c53c16b1021a02e9e855d3877fa050e59a7aecfe117e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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=the+notebook+script+signed PDF link annotation
    • http://peteferix.mypressonline.com/high_performance_cluster_computing_architectures_and_systems_volume_1.pdfIn PDF document text
    • http://reassurez-moi-fr.info/pujuzibeloeqggl.pdfIn PDF document text
    • http://wodekenizowa.getenjoyment.net/kujobetagimoxukep.pdfIn PDF document text
    • http://pasendapp.online/imek_hrsz_2_trke_dublaj_izle_720pt39hj.pdfIn PDF document text
    • http://nevinidonet.mywebcommunity.org/how_to_unmute_sennheiser_ew_100_g3_receiver.pdfIn PDF document text
    • http://vas-rem.ru/wurilovidagozsktt.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/zevivugexojexuluxiri.pdfIn PDF document text
    • http://afterdealer.pro/suxuti3ti5z.pdfIn PDF document text
    • http://jiliwurevefo.22web.org/rozotat.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/7ebcef8a-c540-466f-8d92-d23c4a36b1ce/how_to_make_your_own_advent_wreath.pdfIn PDF document text
    • http://zadabodemuliju.epizy.com/buchi_rotavapor_r_124_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2cb9ed-de01-4d94-b000-3522494d2555/how_do_i_reprogram_my_liftmaster_keypad.pdfIn PDF document text
    • https://e05bdd54-7536-4db1-b7ed-110d7b12163e.filesusr.com/ugd/dd5a80_cf8ab445c69f4f7a9784bf9810daaea7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49345ffe-341b-4c59-920e-fa552b2d6c7e/does_a_leo_man_play_games.pdfIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_83be04e81962476598559cda091fc6d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43458f19-47df-46f1-9c28-02a887be85fe/29877671139.pdfIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_e44bce5891914020aea2388482fec62f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68cd5803-4e6d-4bc5-ac02-3a2693bdb40d/lekawirot.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_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 5244 bytes
SHA-256: f315ecf7c919a8ea74ce62456fadb0fcd6c376548359f35427922babc066d193
font_01_sfnt_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 11512 bytes
SHA-256: 754c302732a9440e2fc56e05cb9e15307b8cdf9b6b767a816c91df692a294f57

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