Malicious PDF — malware analysis report

Static analysis result for SHA-256 c372611eec625355…

MALICIOUS

PDF

77.5 KB Created: 2021-03-15 18:51:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e38c6511621ec0dd94e7574d7802e286 SHA-1: 1c8c9d3e60ea0debe8eb83b3d77dde0e3122f90b SHA-256: c372611eec625355d11f6ee5466cc6e756c64ecbebe575755bbc242f651d2513
186 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, characteristic of a link farm designed to distribute malware or facilitate phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • 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://xajibur.ru/wix?keyword=hindu+temple+of+hampton+roads+timings
    • http://kumululurug.scienceontheweb.net/coordinate_plane_worksheets.pdf
    • http://wejuveziwep.mypressonline.com/sonulejezorenewixineto.pdf
    • https://sojikopel.weebly.com/uploads/1/3/4/7/134760404/zukikezaf_fowiwasusudotab_jafikutidaji.pdf
    • http://javefuxola.getenjoyment.net/how_do_i_change_my_fitbit_charge_4_to_24_hour_clock.pdf
    • http://womuvizitina.mywebcommunity.org/nuwunebokivizege.pdf
    • http://dududuw.mypressonline.com/33495317937.pdf
    • https://xifabaruwene.weebly.com/uploads/1/3/0/9/130969291/kedope.pdf
    • https://falugasotemo.weebly.com/uploads/1/3/1/4/131410545/d8b61828dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_f112698083ea4618882ced3257e32007.pdf?index=true
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_771bc26481aa4313a997f75c35ff4114.pdf?index=true
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_0984c95ff49b4453af466c2e8fc538a0.pdf?index=true
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_771e34c72b084d778043a84adefa7c94.pdf?index=true
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_44d3ffe1fa7245cc92fd0c71b4b4337c.pdf?index=true
    • http://zitasixan.atwebpages.com/pedestal_bearing_assembly_drawing.pdf
    • http://zevesijuduma.atwebpages.com/cathleen_ni_houlihan_yeats.pdf
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_cafff259463a4cf2991a2add1199490a.pdf?index=true
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_3e5e3cc42f9841bfa83787bee0fbe8e2.pdf?index=true
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_480d7b12126940078a93cf68d8c5bbd8.pdf?index=true
    • http://nukilaba.myartsonline.com/667813368.pdf
    • http://sojufuka.atwebpages.com/defending_jacob_season_2_who_killed_ben.pdf
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_89f7a865b5394e3eaaf48eaaebc77559.pdf?index=true
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_901bdbd99ea24571ab248b02990aaab5.pdf?index=true
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_6942e505eac84d568e53940b52831fc6.pdf?index=true
    • https://5b3a2631-baab-4d1f-8161-183aa5bfd7a2.filesusr.com/ugd/5dc2b7_755f78aac02141b482a4e0235d967ce8.pdf?index=true
    • 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_off0000f0d1.bin
116badead9fa51b57abdb491dae0b0e3d20ac5ac270ead37ca6133039e92ead4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 5416 bytes
font_01_sfnt_off0001030a.bin
1076a83334ecc6870f5de0400f0d3649252ea19dfc6717d2abea62a3fb91e12e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 10840 bytes