Malicious PDF — malware analysis report

Static analysis result for SHA-256 154244f36fbfba99…

MALICIOUS

PDF

86.2 KB Created: 2021-03-29 03:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ad007873897a8f3480f813a8f555e2ce SHA-1: 1144ff28cb5338ae5e80baa9989b3103f66a2fac SHA-256: 154244f36fbfba99ae27f78ef978d170f74ece16ca8840ff78ca42c7f91e221d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://seumenha.ru/strik?utm_term=hp+designjet+500+printer+cartridges PDF link annotation
    • https://riguniliwegab.weebly.com/uploads/1/3/5/3/135342973/1466137.pdfIn PDF document text
    • http://help-violation.com/tawewovex8ey.pdfIn PDF document text
    • https://velalozelo.weebly.com/uploads/1/3/4/4/134498802/fizek.pdfIn PDF document text
    • http://carbags.site/what_is_meant_by_statistics_in_englishj78a0.pdfIn PDF document text
    • https://cdn.sqhk.co/soxosovave/jdicVOW/verizon_cloud_will_not_backup_contacts.pdfIn PDF document text
    • https://cdn.sqhk.co/xidupesijij/aQHhjic/pekosopemoxetiwobum.pdfIn PDF document text
    • https://litizabege.weebly.com/uploads/1/3/4/7/134713043/5767068.pdfIn PDF document text
    • https://cdn.sqhk.co/dajuzafum/fhgtSgi/dorabazelofojexepebin.pdfIn PDF document text
    • https://vufupobuzalezu.weebly.com/uploads/1/3/4/8/134853030/5971057.pdfIn PDF document text
    • http://beach-fruit.fun/ashrae_handbook_fundamentals_free_download2xm19.pdfIn PDF document text
    • http://wowivawod.iblogger.org/the_room_movie_2015.pdfIn PDF document text
    • http://gachihyper.xyz/war_thunder_squadron_battles_schedule_2020swo2e.pdfIn PDF document text
    • https://cdn.sqhk.co/lokijuzim/ibLPyII/tenancy_lease_agreement_template.pdfIn PDF document text
    • http://nufurimuler.iblogger.org/banewiwutas.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/0kggjbf/burevufego.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/gozifep/cerebriform_nevus_causes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a70b51-5bbd-4859-91b5-a25e4a7006fb/heat_n_glo_fireplace_remote_kit.pdfIn PDF document text
    • http://nigukeja.epizy.com/61333240864.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/sudozotefakekux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81a2d82d-9b1f-45d1-bda7-c98e813bc64e/68727785368.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/numexuvufolidekig.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_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 5512 bytes
SHA-256: 4fd57b27563e125ab4cf119ba766411635db7f7d45abba4eed11e724c119083d
font_01_sfnt_off00012651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12651 10892 bytes
SHA-256: 3e6c2babad9b3bd7fbd4ecf49260069929f9dff486c7ecf151f37a7af45d0889

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