Malicious PDF — malware analysis report

Static analysis result for SHA-256 833a66360d4c58d6…

MALICIOUS

PDF

76.9 KB Created: 2021-05-15 01:39:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: becf13c1b15c88232fa36e79c8db0b11 SHA-1: fbbc6c69603ea910aaa87e4fa70159cafa54901b SHA-256: 833a66360d4c58d649ee06d352faa8bea96276e3ddc79941763c200f75bf8cdd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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://kuzutuzo.ru/strik?utm_term=forklift+training+video+german PDF link annotation
    • https://cdn.sqhk.co/navotezive/jOm9FMg/35353321828.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/sumixuvukisewo_tujidozer_mozun_jobisoxesan.pdfIn PDF document text
    • https://javubabajekav.weebly.com/uploads/1/3/5/9/135957287/2150936.pdfIn PDF document text
    • http://bufibinokurun.scienceontheweb.net/womarom.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/74362072265.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/Fgjgdjv/american_airlines_flights_to_miami_from_newark.pdfIn PDF document text
    • https://domoposuselof.weebly.com/uploads/1/3/4/7/134720049/2068352.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/Yhhgeio/teacher_apps_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a3c0a8e-c137-422e-a817-ef9977d16179/pictures_of_hollis_woods_movie_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/vewakigosagaloxadavidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d67bd6d6-2b78-4b11-aacc-d64d28859c90/14123854717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a36d28f-a7bb-45c5-9db2-cc21b5d97a96/graco_lauren_crib_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/81806743552.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/the_power_of_now_audiobook.pdfIn PDF document text
    • https://0b670cc3-d94b-4117-8b98-7ce677fb6c21.filesusr.com/ugd/7bc559_647872a67bc94ef99b9a5a4472fd0aed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7163a3c4-00df-4e12-8577-c295f47639b1/quadrafire_pellet_stove_thermostat.pdfIn PDF document text
    • https://1bc2da55-d9f9-46f5-9d67-b48dc82c85d4.filesusr.com/ugd/957ce7_9d7470d7dde44ef3b43804ab2545f1cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/red_formal_gown_plus_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c13dd91b-5670-4fe1-a897-05a68fa5eca7/52746869581.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_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 5128 bytes
SHA-256: cc1c67094cdb4d2b71a8981a8d82873dacb567048b054ecbc4ec6d49d117bb17
font_01_sfnt_off0000fee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE2 11680 bytes
SHA-256: 57aa2f667466cf67e364185f5d8cd465ecd1e3327803125eaf47c3b4b2b99e02

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