Malicious PDF — malware analysis report

Static analysis result for SHA-256 38355c4205212a82…

MALICIOUS

PDF

69.3 KB Created: 2021-03-24 18:17:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e17da422d2bc81fccf325a5e8b3e7e0 SHA-1: 59c3be7b213dcdb033b8a87ffa6b619d11ba5eed SHA-256: 38355c4205212a82b12759e1f4ab1ac885fd93f5bfcb9bb9beb933a261c1d125
186 Risk Score

Malware Insights

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

This PDF document, identified as malicious by ClamAV and an ML classifier, contains a large number of external links, suggesting it functions as a link farm. The document body text, though heavily obfuscated, appears to reference a 'Siemens 400 amp manual transfer switch', likely a lure to attract users to click on the embedded links. No scripts were extracted, but the presence of numerous external URLs indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-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://kuzutuzo.ru/wix?keyword=siemens+400+amp+manual+transfer+switch
    • https://nefabilaj.weebly.com/uploads/1/3/1/4/131438225/xiwefujiwexir-nulurawigido-rivuduj.pdf
    • https://kusazejur.weebly.com/uploads/1/3/1/4/131437880/1207146.pdf
    • https://kidodizaramaba.weebly.com/uploads/1/3/4/0/134096495/129cfbc64a.pdf
    • https://static.s123-cdn-static.com/uploads/4403937/normal_5ff16c54d72b2.pdf
    • https://cdn-cms.f-static.net/uploads/4380887/normal_601fb6fce2b9a.pdf
    • https://cdn-cms.f-static.net/uploads/4469837/normal_5fe917a939a2a.pdf
    • https://cdn.sqhk.co/vobipibomuk/ymghrjj/online_business_ideas_for_stay_at_home_moms.pdf
    • https://static.s123-cdn-static.com/uploads/4470683/normal_6003b9c164ad2.pdf
    • https://cdn.sqhk.co/nadoranur/pOpghij/restaurant_paradise_sim_builder_apk_download.pdf
    • https://cdn-cms.f-static.net/uploads/4421639/normal_603532e3b8b1a.pdf
    • https://cdn-cms.f-static.net/uploads/4470832/normal_60245535a6ffe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/20897fbd-ef07-468c-a6f4-e9e58ba16c13/remikopi.pdf
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_2e7c4b3a108b46f2bbed9f75b1b56ada.pdf?index=true
    • https://uploads.strikinglycdn.com/files/46d16ea2-c97f-4ec8-9792-d5620a9980c9/lapetekalipegalogemola.pdf
    • https://uploads.strikinglycdn.com/files/fd0f7ffa-22a8-4e82-8a13-1d59c49bef01/lugiwefifusugij.pdf
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_a2bc6e7eba7e4a899e46589e625c6838.pdf?index=true
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_8f308212ffea450bb9d032c679486916.pdf?index=true
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_e393439cc1a74e38b80234dedfe842cb.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_off0000ce08.bin
bc7d66fde5977db1e7cd2c1fdbdfefefd6930992168c55c235101896446521d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE08 5680 bytes
font_01_sfnt_off0000e149.bin
d8e25d25befd6a02fa33be592ed01f7058b6ff4fe9d9bff54b30ff8f033f975f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE149 11308 bytes

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