Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d6b134cb58f98f…

MALICIOUS

PDF

72.4 KB Created: 2021-09-22 21:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 991470de8b514216286ecf85e8682b4e SHA-1: 881e55b7b1b8bcb2192105b06c34f072bbf0f56b SHA-256: d8d6b134cb58f98f6c6d694dc3c64b5adca6aa722151b2b828d60ed71341fb4b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains hosting PDF files, indicating a link farm or distribution mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is an attempt to lure users to potentially malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classification point towards a phishing or malware distribution attempt.

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 http://artospace.com/pics/file/51108688313.pdf In PDF document text
    • https://novinfasteners.com/userfiles/file/nuvuponojebu.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/87736553223.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/46733377924.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/68970200501.pdfIn PDF document text
    • https://mandaljeebanking.in/ckfinder/userfiles/files/fovijerax.pdfIn PDF document text
    • https://reha.bg/content/upload/file/80654692696.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109180921107252.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301be528c93---48632489349.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/vivuxerinofitujigavuleze.pdfIn PDF document text
    • https://parc-hotel.info/file/86191201358.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/54960972634.pdfIn PDF document text
    • http://dalaichau.com/files/38008506608.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/lidimilewamivumoxasudof.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/gemozezefagukopenaj.pdfIn PDF document text
    • https://funke.be/data/file/88144631127.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/nesukumejalafilijanum.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/68921536302.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/88706058167.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210905103829.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/kexegijopujapik.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210918/16319011134170.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/27028131705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+hitman%27s+wife%27s+bodyguard+full+movie+onlinePDF 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_off0000b523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB523 17288 bytes
SHA-256: 5f90fdc457d7042df7b34aa60175a8e9db5eac69d9a23de0973910e4724ea225
font_01_sfnt_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 11304 bytes
SHA-256: 1ad213f1bd2514d942b4c6178c81f5f8f6c8f0dd929812654aecfdeb2e11865d

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