Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c50a0175838d15…

MALICIOUS

PDF

75.6 KB Created: 2021-03-21 21:57:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 88c7f83c7498a19f32f39ecbf91b4424 SHA-1: 221af9dc40b737ded7b3135415352a245c81f5df SHA-256: f9c50a0175838d156ec1fda91cfd321d2552898b8904bf390db6803866a63de2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a high concentration on disposable hosting, and one prominent URL (`https://soxebez.ru/strik?utm_term=what+are+the+12+steps+of+drug+rehab`) appears to be a redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, aligning with the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/strik?utm_term=what+are+the+12+steps+of+drug+rehab PDF link annotation
    • http://help-business-media.com/popilifimomuzeb8n0k3.pdfIn PDF document text
    • https://putonikasobex.weebly.com/uploads/1/3/1/0/131070178/9b092ec2d099.pdfIn PDF document text
    • http://kittyplay.online/atoms_and_molecules_worksheet_middle_school1i4ry.pdfIn PDF document text
    • http://iranomics.com/duties_and_responsibilities_of_an_operations_manager_in_a_travel_agencyn6e5m.pdfIn PDF document text
    • http://casserlabs.xyz/71143860957oeo7a.pdfIn PDF document text
    • http://dirtygirl.fun/87920788544iqfq9.pdfIn PDF document text
    • http://grizhoff.ru/tutagaiglir.pdfIn PDF document text
    • http://autocredit.moscow/tokurubusarewobaj2r3le.pdfIn PDF document text
    • https://jidupedepinamup.weebly.com/uploads/1/3/2/6/132680921/3002770.pdfIn PDF document text
    • http://simomezubuxo.22web.org/how_to_reference_a_book_chapter.pdfIn PDF document text
    • https://kuvenamowafave.weebly.com/uploads/1/3/1/3/131379608/vusakigexi.pdfIn PDF document text
    • https://lakojelot.weebly.com/uploads/1/3/1/6/131637836/vuzexow.pdfIn PDF document text
    • http://cmb-accueil.com/jopesozibuselavenegwry8t.pdfIn PDF document text
    • http://e-devletodeme.net/89601488112thkk6.pdfIn PDF document text
    • https://minomawisagu.weebly.com/uploads/1/3/5/9/135956859/kefit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ledukuxadom.epizy.com/carti_despre_antreprenoriat.pdfIn PDF document text
    • http://jajoditad.rf.gd/zusod.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/99112790804.pdfIn PDF document text
    • http://janevowox.epizy.com/98711425909.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/4084000238.pdfIn PDF document text
    • http://jusexumiponif.rf.gd/how_to_sew_a_pleated_mask.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/estudio_de_factibilidad_tecnica_de_un_proyecto.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/simplehuman_auto_hand_soap_dispenser.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_off0000e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 5608 bytes
SHA-256: 724cc00df87d306ab6fa323214c5960b45877d15656909e726951d31ff3e9a22
font_01_sfnt_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 10628 bytes
SHA-256: 9e36cf1c64cbc3dca99bc21e2a7e5262f44f94d539a381db75a21fb79aad9550

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