Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc34d351d7749f4f…

MALICIOUS

PDF

75.6 KB Created: 2021-10-02 17:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a9009f2a9496877e40e5323eef77cef6 SHA-1: 86ca3713b8ae6bf881eb65bf9b9ae702ccf2d4ff SHA-256: fc34d351d7749f4f8c2e8272799e862877dc2cb7d4e55957bd74c3082b20ad83
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 trojan. It contains numerous external URIs and is structured as a link farm on disposable hosting, indicating an attempt to redirect users to malicious sites. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://coretry.ru/uplcv?utm_term=ray+diagram+of+concave PDF link annotation
    • http://esangsok.com/upfile/files/23344740689.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/60317133765.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/juletutado.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/41106060540.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/56218448830.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210908232107388974.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/wixejelenat.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/zegepilonajevasanid.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/86840297386.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/26434328328.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0351e4dd0cf74af070283cce4ee198c8/raxarazewitujeg.pdfIn PDF document text
    • http://josquin-capella.de/download/jenezosebuwot.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/vopida.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/61989803487.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///keximegetopoz.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/wulazijipumelazikel.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/zuzawurejejedunivun.pdfIn PDF document text
    • http://4bx.pl/public/file/87534606633.pdfIn PDF document text
    • http://yoron.net/up/files/51680117716.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/vilugit.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/penaz.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/59034222668.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/19777248124.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/63579887701.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/68054737648.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/2932092388.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_off0000c07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD891 18676 bytes
SHA-256: be6b2da05c5d9813d4877dfe7de4c833199a7954b3a655c25c43d607b9db601c
font_02_sfnt_off00010843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 10732 bytes
SHA-256: 2006ec01b30ad6a366e945d29fec35ca616b9029617576f7d403c0c1a7a8d577

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