Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb971f2ca89ed6c1…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 14:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a4804789a529636cd5c8d91190e37968 SHA-1: cbf1e76c7e38e3b69648b0c1b05e3553b7b91287 SHA-256: bb971f2ca89ed6c12497bdd668ae912a90dc9d203534941c5a0bc2daa8f2b95a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. The PDF contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://heatherjansch.com/ckfinder/userfiles/files/70342347551.pdf In PDF document text
    • http://giorgimpianti.com/userfiles/file/tonofemanaxazuv.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca08536e5a---xojiwedusar.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/liwuxibadupu.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/7c6e1ac05cf3be13dd9bd30ec7c2ed1e/dememafudo.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/11147402606.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109181113325408.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/75959146139.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/ralotumivaxisatimumol.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/kafepor.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210904095905.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/19252175014.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/weravarixumadubikoza.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/jigaromas.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/kegitukowupu.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/470800882.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/tekevibasedo.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/91536411093.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/mojifafovabiduwigapozop.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/wuwusunuzuviw.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/ralekujo.pdfIn PDF document text
    • http://arsvet.ru/img/upload/mefimunadeka.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/95284084048.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/96451542348.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/wulesibakex.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/rolimukokigusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=popup+ad+detectorPDF link annotation
    • 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_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 10200 bytes
SHA-256: 176312fc795adc698fcae5058de4bd8530210d014c1368a148f932a089491e68
font_01_sfnt_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 17868 bytes
SHA-256: de7a9016f335edf786c871a21095f7d8e6edd794298875878ff368c298feeafe
font_02_sfnt_off000120e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1