Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79ffc9832cb41f4…

MALICIOUS

PDF

70.0 KB Created: 2020-11-19 12:39:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8f7ebf63ce945bc8e0974537e54e492b SHA-1: d50273ee29b71e35e5991fa38a4c6ece3627a4a8 SHA-256: c79ffc9832cb41f4837e65165c195fe6145b107661e7cbf51a19c03907471934
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors like traffking.ru. The document body, though heavily obfuscated, suggests a lure related to 'aicpa ethics exam answers pdf', indicating a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/strik?utm_term=aicpa+ethics+exam+answers+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4500187/normal_5fb60fedb2f7b.pdfIn PDF document text
    • https://farufawajil.weebly.com/uploads/1/3/4/7/134726947/1485394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392860/normal_5f970f48017dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f87549f37854.pdfIn PDF document text
    • https://bijimeko.weebly.com/uploads/1/3/4/3/134327756/lozat-vogomo-kogetilokogo-jutoruvuni.pdfIn PDF document text
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/840b1f969ee0.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/xurejetexu.pdfIn PDF document text
    • https://rawabibag.weebly.com/uploads/1/3/4/8/134870232/8a1c60d4bc74e.pdfIn PDF document text
    • https://veraweno.weebly.com/uploads/1/3/0/7/130739577/majurarilorafub_poxetedosola_befit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/street_fighter_apk_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe723478-2be2-48f2-a63b-aeba31ee3c12/bafx_34t5_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4761f8b-0fd8-4ed8-be67-08058e25accc/titinaretowewifebomese.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/genesis_baptist_church_athens_tn.pdfIn 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_off0000d444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD444 5512 bytes
SHA-256: 224898be39f1a7d4b760837978dd309b4208df6f710b7f51b94af203e3ae816e
font_01_sfnt_off0000e6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 10880 bytes
SHA-256: 7c2e408908c0bb832154bb996d041e1adcfb8b42d4cf9cc749d0455fc0f503f9

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