Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b6b597141d92f8…

MALICIOUS

PDF

71.7 KB Created: 2021-09-25 11:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 17a0577c62f2d9f322053a2623109a21 SHA-1: 44947056ded5942db8f1e0839259cd7dad5135b3 SHA-256: 97b6b597141d92f8fffc3edbbc77076dce20d7f09b7aeb14c9211b5431d59a4e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://irlanc.ru/uplcv?utm_term=advanced+javascript+examples+with+code+pdf PDF link annotation
    • http://96stone.ru/userfiles/file/5565616758.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/3304736245.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/43893362569.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/5333276262.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109090609562548.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/sovipumawiluwaneguwu.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/96560958252.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/forewajefavuwodukobabu.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/663249123.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/62891280740.pdfIn PDF document text
    • http://megalaserasia.com/upload///xivujemerototozozibi.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/fatogizorofakikazuwalerix.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/mutigawinubosokapile1630861908.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/bavuxifadira.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/vadanuvijajafugupafomutat.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/41626084212.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/4103574832.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/japugoderodibufero.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/fuvejupu.pdfIn PDF document text
    • http://btfa.tw/upload/files/2867062249.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/fovod.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/julafegabuvaxagufel.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/76e3f5cdf56b5988d47ad3d0bbe84b79/mojajotezotut.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/34520740309.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/43199045709.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/nesuwoburesujap.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_off0000b25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25F 16940 bytes
SHA-256: 0def2ff78edecf5b2feb9d13b3cf3102875d61afe5ed6111835052d61521c580
font_01_sfnt_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 11252 bytes
SHA-256: b38963fda88f53db6dec30dafa43bd00031907614e44fcd3fa1410dac5eaf947