Malicious PDF — malware analysis report

Static analysis result for SHA-256 743b5174b1c126bb…

MALICIOUS

PDF

127.2 KB Created: 2021-03-19 17:30:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fba6e1ac8217ad1d8831a01bfddd1031 SHA-1: 9d64a78abfe13a200a62e45b45c3c6133441a565 SHA-256: 743b5174b1c126bb552ebb765259c2fbab101262f78e16264c9535dd0fd3a990
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://botokaw.ru/award?keyword=acquisitions+incorporated+pdf+online PDF link annotation
    • http://lebepufu.mypressonline.com/miketilituzuzegedepos.pdfIn PDF document text
    • http://jetiloxabutu.iblogger.org/10757227227.pdfIn PDF document text
    • https://cdn.sqhk.co/vakinebavun/cCgjQi5/41308619215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480889/normal_602c6d7d272d9.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/fjcJIot/bitaje.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/70831190215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490754/normal_6014711516cf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527902/normal_60378c93c7d91.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_4a6253750a0f48009f5fe521b56abfe4.pdf?index=trueIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_3fd8b001c1284461beec077c8fbb6ea9.pdf?index=trueIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_f822843767f44d728d985ee4e111a8f0.pdf?index=trueIn PDF document text
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_6def22a7bacc4710a9491d5d166e9416.pdf?index=trueIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_eddf574570794b8b8d36ff3b458a23ae.pdf?index=trueIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_fe10239b6be14075842eed49e4215bd7.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_f75ae949f00e443993a7954c8e877e37.pdf?index=trueIn PDF document text
    • http://fijazuzid.rf.gd/bahubali_movie_video_songs_tamil.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_634d1cdfc2bc4a1e83321321fe8dbc6a.pdf?index=trueIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_874aaedb6a8e413ea904496ba0adb0ea.pdf?index=trueIn PDF document text
    • http://jimuxilobu.rf.gd/84397958101.pdfIn PDF document text
    • http://segurixuzek.myartsonline.com/how_to_be_best_friend_in_snapchat.pdfIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_20ef78a1ae8d4f9b94c48fe2bed6c5d7.pdf?index=trueIn 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_off0001b37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B37D 5264 bytes
SHA-256: 62e245471a4bb409705d256a13b35638203dd7ae596e669c31986dd9013aaaf9
font_01_sfnt_off0001c573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C573 12288 bytes
SHA-256: c9ef28d21fb70f4b484c319db43aa8f98ed11c1db21409e4ee84ea2972dbea48

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