Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc4c835efc1b545…

MALICIOUS

PDF

80.0 KB Created: 2021-03-31 09:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59ab17f7c7717ce1acf8391698745fed SHA-1: 75118f01244d7e57f4fc0373100b6e17cf150bb8 SHA-256: 4cc4c835efc1b545e44fad6d04fd7fe056199963b72abc1b462be313aaed82e2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which are likely part of an SEO link farm. The document body, though heavily obfuscated, suggests a lure related to '3ds max tutorials pdf for beginners free download'. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a malicious intent to manipulate search results or distribute further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/award?keyword=3ds+max+tutorials+pdf+for+beginners+free+download
    • https://static.s123-cdn-static.com/uploads/4492871/normal_6004ddb9ca26c.pdf
    • http://wobodepubusa.22web.org/theme_of_post_colonialism_in_heart_of_darkness.pdf
    • https://static.s123-cdn-static.com/uploads/4500001/normal_5fe373c0ee7ea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d2c41827-dbfc-4b1a-a55b-d0d0caffc7b9/34394819531.pdf
    • https://uploads.strikinglycdn.com/files/12c4a86c-d7ba-4c43-a01f-1d84373bb4f2/how_to_build_a_mob_farm_1.16.5.pdf
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_b0be5087697742aca49ec46ea755d4e1.pdf?index=true
    • http://romevakamijoke.epizy.com/dave_ramsey_financial_planning_book.pdf
    • https://uploads.strikinglycdn.com/files/30e9cbb6-e4fb-4ee8-bd43-873a3fcd68a8/xokoxemodolatulonek.pdf
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_2a6a68ec752346e9b59251ae7700dd0d.pdf?index=true
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_5093301ef1614e54bab1f0bb8463cbde.pdf?index=true
    • https://uploads.strikinglycdn.com/files/eeeda7e7-d5f7-4658-a2b4-74917f50ffa7/what_are_the_seven_principles_of_internal_controls_and_what_is_the_purpose_of_each.pdf
    • https://s3.amazonaws.com/kawotexulozax/xezemobitafuxekiwarisuzem.pdf
    • https://uploads.strikinglycdn.com/files/6d7c3dd6-61a1-43df-9045-fa8851447c77/duraflame_electric_heater_replacement_parts.pdf
    • https://d7504aae-3d37-493f-8789-a5629a6fcc30.filesusr.com/ugd/7ca9f5_a36ee02ef18c447e9f2475015d29a36b.pdf?index=true
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_b0d52c632e6c4220b33aea3dba65875e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/55cf8c73-4167-469e-9cd8-7b5aa20d1485/75740985557.pdf
    • https://uploads.strikinglycdn.com/files/b641ad63-4434-4a6f-a410-d9182b4321a5/ge_spectra_gas_stove_oven_not_working.pdf
    • https://s3.amazonaws.com/sedimeraxufi/extenuating_circumstances_form_essex_uni.pdf
    • https://s3.amazonaws.com/gazivemon/pukegimuwomavajixetidabew.pdf
    • https://s3.amazonaws.com/runuzitexokol/38161686325.pdf
    • https://uploads.strikinglycdn.com/files/a2e7c94d-f47a-42cd-8acb-0d7229b9847c/20738365390.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcad.bin
693fbf69913cd6215790ad2b695968c91a1cecffc15ff0bc0f3e1a9752d39b59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAD 5732 bytes
font_01_sfnt_off00011024.bin
c3a37964c29debbdbe22f5b5adcd80980ec5a5d03089145b71967df2448f2a43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11024 10140 bytes

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