Malicious PDF — malware analysis report

Static analysis result for SHA-256 381b51b7b14fa7ca…

MALICIOUS

PDF

77.0 KB Created: 2021-01-24 10:39:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 026c7d2e2ddea0303ff5196994ada8cc SHA-1: bebc75f87bdc013591453d639eb4fa08cf8e3872 SHA-256: 381b51b7b14fa7ca867b9905e3d629f21f40d92ae5ad0db03cc5abfc598909bf
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. The document contains a large number of external links, characteristic of a link farm designed to direct users to potentially malicious websites. The embedded content suggests a lure related to academic assessments, likely to trick users into clicking the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffine.ru/123?utm_term=chapter+7+assessment+world+history+answers
    • https://bagubabijotete.weebly.com/uploads/1/3/4/3/134319258/nimefuzizoz.pdf
    • https://cdn.sqhk.co/gukugifixija/kTlgihc/drift_tune_forza_horizon_4_rx7.pdf
    • https://cdn-cms.f-static.net/uploads/4382781/normal_5fd7d67f2a19b.pdf
    • https://cdn.sqhk.co/futevanu/j7kjjtK/another_name_for_powerful_businessman.pdf
    • https://cdn.sqhk.co/baluwofuk/dic3zic/foviruzidarujavefimeweg.pdf
    • https://cdn.sqhk.co/vimexuda/hibjdjd/zombie_rising_dead_frontier_hack.pdf
    • https://static.s123-cdn-static.com/uploads/4410222/normal_5fd038de4a868.pdf
    • https://site-1168140.mozfiles.com/files/1168140/kakudegoko.pdf
    • https://dolujutizividev.weebly.com/uploads/1/3/4/8/134864897/beminamikakiw.pdf
    • https://cdn-cms.f-static.net/uploads/4426063/normal_5fd927dbd543c.pdf
    • https://static.s123-cdn-static.com/uploads/4370541/normal_5fc6ac688c1b1.pdf
    • https://cdn-cms.f-static.net/uploads/4424672/normal_5fe79227916d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://nonavijewiw.epizy.com/21650160425.pdf
    • http://wereguvepowu.epizy.com/tezanofewumiwikawufewisi.pdf
    • http://fudotebu.epizy.com/74793769465.pdf
    • http://sajipesexadagon.epizy.com/tecnologia_informatica_mutis_2019.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce01.bin
275b7ea1053eb781513c7dea2b8f458bcd7a9a21b2b4fe28cf6f604453b8c391		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE01 5284 bytes
font_01_sfnt_off0000dff0.bin
d3986bc1aae76baab3fe5396ea88e7e31a64119b09fad90f0eab1518337e15ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF0 10304 bytes
font_02_sfnt_off0001035b.bin
352e8ac9144b91a5ad7554cb4e2c7c01850f14fca47a126762e475da8f9ed53e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1035B 16120 bytes
font_03_sfnt_off00011837.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11837 4324 bytes

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