Malicious PDF — malware analysis report

Static analysis result for SHA-256 3329d0afc803971a…

MALICIOUS

PDF

73.5 KB Created: 2021-10-04 06:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9f5c70a024dd9abf761cc2bed6db5bce SHA-1: 9df9ac0c9255cda93d71eafb5fc30acce59733ee SHA-256: 3329d0afc803971a0f298880bf4d5f45f1c0e75602a5bbe1d2e63ed82657569f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The PDF structure and embedded content suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=now+in+a+sentence PDF link annotation
    • http://canadapremiumlubes.com/survey/userfiles/files/fodewu.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/lekaligilog.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/bufozipowogati.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109180053038614.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/nunivamur.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/zoresutopesiku.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/seduvexuxanotolejak.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/nopifirakakumupi.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/53572573937.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/tadobenufopukozo.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/81078190732.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/kewowa.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/5917416074.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/witerowemeni.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210929192401_5hy2kz.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/55588591115.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/lumukeniwa.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/rufalejisidivudaretotus.pdfIn PDF document text
    • https://foulardfotografando.it/file/88752390797.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/26775799631.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/zilamonudezamab.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/16015148176.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd1ab5f1ec---10492413506.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_off0000bbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD1 18104 bytes
SHA-256: 177e127bedcedc141f022467ab1858e48caf996d04c200ca6346f6e9eb3c5df1
font_01_sfnt_off0000ea1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 10140 bytes
SHA-256: cd885dbc353229fac6d5895d05eadaaf2ee67a6af5136aa718987c41d7d02c89
font_02_sfnt_off000100fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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