Malicious PDF — malware analysis report

Static analysis result for SHA-256 086aa09148706036…

MALICIOUS

PDF

74.9 KB Created: 2021-10-08 10:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 11463f3fd7698a920ab5643ea69202eb SHA-1: aef318a71e1d70ae1090277fda6fe7a27e379e0f SHA-256: 086aa091487060369cea0377357de93dabf1f8c528d889279f0e0a481d24281d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are on disposable or low-reputation domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=bennie+and+the+jets+piano+easy PDF link annotation
    • http://holzbau-napetschnig.at/kutalajud.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/17047376842.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/96732645103.pdfIn PDF document text
    • https://atlantidegattico.it/file/22191471622.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/lexuwinumi.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/34519728111.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/53236733963.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/fibirajax.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/tagelapomejugijigeta.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/ketesufikiwovujadigij.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/folibaxep.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/98298812747.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/mevomenosozixafetefejod.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/7428626286.pdfIn PDF document text
    • http://airfa.it/userfiles/file/17408078697.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/lepuxaxuvup.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/ravovexi.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/liwewewixilixiw.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/kemofurugizejunedesimodor.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/78773576514.pdfIn PDF document text
    • http://centronegozi.com/public/rumorunirejijerabosal.pdfIn PDF document text
    • http://yanartextil.com/firma/files/8289320330.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/badufipo.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/kikataxogamokatadulazak.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29A 16656 bytes
SHA-256: f03d22e51200a065371e977036969b5fdcb53c023c66818e18230c1bcf6859c5
font_01_sfnt_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 10640 bytes
SHA-256: eb4ac86805c0e410de2db64682ec50b6eaf525c0c4cae788278c01c64f2644fb

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