Malicious PDF — malware analysis report

Static analysis result for SHA-256 4591d0b8b3611758…

MALICIOUS

PDF

81.7 KB Created: 2021-03-21 09:21:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3ec8449c2e655d5aa1363c253242b256 SHA-1: b0b3854ac4e1e30138fcab09f2f407f3ae693853 SHA-256: 4591d0b8b36117582dfada980d72c128e42547721d20e745c8c8273274bf5885
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though partially corrupted, suggests a lure related to a 'free first aid course'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=curso+virtual+de+primeros+auxilios+gratis+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472182/normal_6056c1c82bd92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475559/normal_604ab51a44f58.pdfIn PDF document text
    • http://afracheat1.xyz/47101742212a1pqe.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/a0XyxEI/kanumexoxuvagagabotogego.pdfIn PDF document text
    • http://alphabitx.com/96835774159xn260.pdfIn PDF document text
    • http://drenajkrasnodar.ru/is_the_fall_based_on_a_true_storyhrb77.pdfIn PDF document text
    • http://bodyita.space/baby_monitor_phone_appnwloq.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/cqNSrjs/gijudixivufep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448733/normal_601868da0e90e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500678/normal_60384f203d840.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/logalotaimd.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/egcThcf/bluff_my_call_apk_unlimited.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406213/normal_603aac904826e.pdfIn PDF document text
    • http://sarkife.site/lodoxunikebiwusexj0jl1.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/eIhhkjf/205026436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402294/normal_6028771275eba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413465/normal_603da92b1e537.pdfIn PDF document text
    • http://pearhaidhr.fun/diplomat_watch_winder_repair2imrh.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/7fed7d39-2a81-4564-bf34-0830cfb51a19/next_seal_team_episode_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dc928f8-8576-4560-8cb3-a4493267cb12/ge_oven_326b1230p001_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1d7ea47-718b-4c25-8c87-dba984ab8d72/gejupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/284caa8c-c8d8-4aab-b08c-8b49a9da6ad2/mivofije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75696ed0-6afc-4ce3-a724-152730eeb1ac/fuzibomixonulu.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_off0000f95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95F 5792 bytes
SHA-256: 5bf90cf47acedc7978328bfa11b03f2f8778743b447bf53984acc2033e6380a5
font_01_sfnt_off00010d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0A 13244 bytes
SHA-256: cde681d3bd690fef77eb284573f0481bf2a146b5805f6a38551731db25966198

Open this report in the interactive analyzer, or submit your own file for analysis.