Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dde922c399439d6…

MALICIOUS

PDF

82.8 KB Created: 2021-10-10 11:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e84d7f6a8351b84c4b9cc842f489fd17 SHA-1: 970c6f9114f9f41916ff5adbe839d919d421d0a1 SHA-256: 3dde922c399439d650da34760d72f4d6b3d3b74af1f1da6dfe302f49c21f7357
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://archism.ru/uplcv?utm_term=where+can+you+change+automatic+or+manual+mode+in+excel PDF link annotation
    • http://1666-3668.com/attach/userfiles/file/fajusexexitukojid.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/2876350509.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/44935037103.pdfIn PDF document text
    • http://bulmarconsult.com/files/vipevojotokujo.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/texibejorarowasapepajo.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/wupatolap.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/63438812500.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/60424863754.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/fagobinixas.pdfIn PDF document text
    • https://reha.bg/content/upload/file/kemikive.pdfIn PDF document text
    • http://fulico.com/v15/Upload/file/2021922226292346.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/jifimez.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/nejanotozonan.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615a66dd3ce6b---46067863403.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091411293873499.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/2682776803.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/37263500385.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/zuminanulupo.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/29975922823.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/pumiwubufegog.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/pepimibinorimos.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/87958094839.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/xirerebakusifukukavef.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_off0000db2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 10956 bytes
SHA-256: a8a862a95898a045e6a9d340f1217ce9af9cbc6d139427b8a75d1e4a519275eb
font_02_sfnt_off00010c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C49 18884 bytes
SHA-256: 66939f14477ec8fdc2f2d838da21b490100885607809de5273c17fb0197429dd

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