Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9957a851adfc368…

MALICIOUS

PDF

75.2 KB Created: 2021-04-02 08:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: efc0117fe85cff5b25db61e923d75fc0 SHA-1: e8b75ea0a79e0e97b49e88d91f8c374d91242c21 SHA-256: c9957a851adfc368aecac2eeb0118fade90c0760419963b5698cb6f866f9f406
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=how+to+replace+lithium+battery+in+taylor+scale PDF link annotation
    • https://vipefujalebir.weebly.com/uploads/1/3/4/7/134744486/nojubowumaxivejarar.pdfIn PDF document text
    • http://pimidemo.iblogger.org/personal_swot_analysis_template_doc.pdfIn PDF document text
    • http://kind-insta.site/barreras_para_la_comunicacion_eficazoyzxe.pdfIn PDF document text
    • http://usacreditcheck.info/auslogics_boostspeed_8._2x6gee.pdfIn PDF document text
    • http://delayikapy.xyz/tajumatuwevokobageguvusa9djem.pdfIn PDF document text
    • http://carbags.site/simovagabugibenitoikngw.pdfIn PDF document text
    • http://istlan.space/how_to_defrost_frigidaire_commercial_freezerh2doo.pdfIn PDF document text
    • https://zebakikalelu.weebly.com/uploads/1/3/0/7/130775248/kuvob-nagunojowe-mesezujuzosin.pdfIn PDF document text
    • https://rasizuxuner.weebly.com/uploads/1/3/1/3/131378923/gamem_xelikekusodurim.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/zapig_favutevixaninu_ligirugiz_zojakidijamowin.pdfIn PDF document text
    • http://sakivometo.medianewsonline.com/attahiyat_full_dua.pdfIn PDF document text
    • http://motivawka.online/what_is_venture_team05lem.pdfIn PDF document text
    • http://begemotiks.space/p90x_schedule_week_4l95px.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://safinunel.epizy.com/2003_dodge_durango_rt_lift_kit.pdfIn PDF document text
    • http://vukilef.rf.gd/sosesanesurakidutasom.pdfIn PDF document text
    • http://sujegulagu.epizy.com/652815128.pdfIn PDF document text
    • http://pakapenabu.atwebpages.com/absite_review_free.pdfIn PDF document text
    • http://zudakilaf.rf.gd/pisivatariraxedaf.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_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 5468 bytes
SHA-256: 30e60caa4757e41327771c1fee04b0e6d97390993a93c3c3e6436691dbb38e40
font_01_sfnt_off0000fb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 10336 bytes
SHA-256: 97320ae9358bd74a59294184268470cc6d8129f318e8865261939afa1868e6e5

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