Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e15913d996e8932…

MALICIOUS

PDF

70.2 KB Created: 2021-02-25 13:08:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 21eb802993b01bb608725c5335dab39e SHA-1: d5799886ba27232ecb1c32cbc358b2b4ab0568ef SHA-256: 7e15913d996e8932d3d30223c8ecbf69a62a1e28f9e5d110dad22374344fbb0f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable hosting. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://jacksth.ru/strik?utm_term=crosley+record+player+power+cord+5v+1a PDF link annotation
    • https://nonesuwenuvav.weebly.com/uploads/1/3/4/4/134400251/biruwox.pdfIn PDF document text
    • https://cdn.sqhk.co/wofunukasu/fjh1Iib/karamelupewevu.pdfIn PDF document text
    • http://wagajikis.iblogger.org/weturapibazasixezuve.pdfIn PDF document text
    • https://bokakarepexopo.weebly.com/uploads/1/3/4/7/134750167/9ac6d6a7c5f6.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunudixa/fdiahcR/pilezudejabarubanu.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/eLUpKhg/17261537953.pdfIn PDF document text
    • https://cdn.sqhk.co/wobivada/iijhbhf/joom._shopping_for_every_day_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/djwgjQC/eagles_nick_foles_statue.pdfIn PDF document text
    • https://cdn.sqhk.co/nerurepaza/Thdgfij/85608706027.pdfIn PDF document text
    • http://noviviludizafim.iblogger.org/12424838910.pdfIn PDF document text
    • https://cdn.sqhk.co/jakatote/cojbzgj/98842644808.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/49783107235.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/yhasvBf/nuzijevawefaxad.pdfIn PDF document text
    • https://fafodedok.weebly.com/uploads/1/3/4/6/134602811/luzemojomus_jinonasezopixi.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/percy_jackson_auditions_2021_disney_plus.pdfIn PDF document text
    • http://rebelojujiraw.iblogger.org/rsum_bel_ami_maupassant.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/how_to_evaluate_a_toastmasters_meeting.pdfIn PDF document text
    • https://cdn.sqhk.co/gajerivab/YORYjiw/sewevegajarakoxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD200 5400 bytes
SHA-256: cd5b5b48164e30726e071fde8e4cb0dd39e31d2417b78986ee02b1d7076dc94a
font_01_sfnt_off0000e490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 11056 bytes
SHA-256: 33691f86a8a2a184a918c6945c93f2c7ee683d3455b470604ed90bd8a4698139

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