Malicious PDF — malware analysis report

Static analysis result for SHA-256 9850ef33e63f59c2…

MALICIOUS

PDF

82.3 KB Created: 2021-03-27 23:10:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c612eefbcab33296c444d02824bc352 SHA-1: b4e152a3ecbfca488a1a62a311ed692ae72b6d75 SHA-256: 9850ef33e63f59c26f575538dd8bf4213449d43be0f25971c6701a1a0e9430a1
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farm characteristics indicates an attempt to redirect users to 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://dafemum.ru/123?utm_term=leading+agile+transformation+mckinsey
    • http://vertigoa.online/24767722708d7y1r.pdf
    • http://apparentlyopt.com/23675081285eetts.pdf
    • http://linefofaxugedu.mywebcommunity.org/rutherford_backscattering_spectrometry.pdf
    • http://loveantravel.xyz/kafulumubasakixqo0rx.pdf
    • https://cdn.sqhk.co/vefusujix/jihcChj/wewironapi.pdf
    • http://circulyarkadigital.xyz/mebixabifesoluwepexam53.pdf
    • https://cdn.sqhk.co/lilaxikixo/cjahcii/toxulitularibar.pdf
    • http://chambreop.xyz/546700677087gp2x.pdf
    • http://educationonline.website/nirunonuluvbpywk.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • http://ashotik.space/tension_physics_worksheete33mb.pdf
    • http://mutodute.22web.org/atlas_concorde_marvel_pro.pdf
    • http://nutusugeralinet.mypressonline.com/fuloburutunon.pdf
    • http://dhl-order.info/937412074803k6vf.pdf
    • http://ximoteduzax.22web.org/9120943188.pdf
    • https://cdn.sqhk.co/vawadawuleja/P1gdjib/sowidex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zalezir.epizy.com/bigo_live_connector_android.pdf
    • http://melakevejemi.epizy.com/takanezumovutevegi.pdf
    • http://xakagigoneliv.myartsonline.com/maharashtra_apartment_ownership_act_1970_in_marathi.pdf
    • http://gotikomerutoj.rf.gd/xozaperokavojam.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e1.bin
d24e828eff9b3c9eecffb0716e14148338702fc9b9546d13b9fa840a96eced8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 5236 bytes
font_01_sfnt_off0001049b.bin
c9eddb289fff8826a136dc65b8ed271499c97ab2d4598874fd6a95bbcce97f10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1049B 11980 bytes
font_02_sfnt_off00012c0b.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0B 4324 bytes

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