Malicious PDF — malware analysis report

Static analysis result for SHA-256 c864fe73d01ca6f6…

MALICIOUS

PDF

83.8 KB Created: 2021-03-05 08:41:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 47d96d585adb0ef7891994a642e17697 SHA-1: de3ee31b336c3d21dc7e1a93ee283522d34b82e8 SHA-256: c864fe73d01ca6f6c19fc7f5782556f08804688b619676751002af9bd82b00ca
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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/strik?utm_term=how+to+pair+sb400+subwoofer PDF link annotation
    • https://cdn.sqhk.co/xenivoronizu/hbfgegg/wehrmacht_easy_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457592/normal_5fd5f600ba7b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387713/normal_5ffdbb006a23b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381997/normal_603bb5b4b06f3.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/94050468268.pdfIn PDF document text
    • https://cdn.sqhk.co/goganededem/blJhbhj/best_drought_proof_plants.pdfIn PDF document text
    • https://cdn.sqhk.co/burexewejam/ihijdgd/diragawuserogi.pdfIn PDF document text
    • http://fuvesozufinefi.medianewsonline.com/30166592640.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378379/normal_6000691ce04f4.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/jwhhghe/finger_guns_bisexual_meaning.pdfIn PDF document text
    • http://watogoda.mypressonline.com/where_can_i_find_sat_practice_tests.pdfIn PDF document text
    • https://togezajotutev.weebly.com/uploads/1/3/0/8/130874352/detelomolef-pixufamalilumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450158/normal_603760d9976c1.pdfIn PDF document text
    • https://jimigafekalese.weebly.com/uploads/1/3/1/4/131407537/woroju_vizexox.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/muvevanepen/author_s_purpose_pie_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/free_arabic_fonts_for_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1b43f70-5f10-4b9c-ab85-fe56cd53fe7b/nugopofedob.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/4369426138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f2cce03-02e2-4dc6-b5e2-fba1794b0d56/what_do_you_give_your_godson_for_his_baptism.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/relation_between_cartesian_and_polar_coordinates.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/jodakekekegaperegixe.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_off000107e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 5284 bytes
SHA-256: fdcc97c82f3cf299a4144cec452b5204701379af9c25e5996f51192e57534812
font_01_sfnt_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 11408 bytes
SHA-256: 5e6865ca8e5ac17b6fb129be49b530ea2153a09321b5a49220d00a845a1619c8

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