Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ad7972426ff99d…

MALICIOUS

PDF

70.7 KB Created: 2021-09-20 08:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0740b204a5138a72a068b208a828b63f SHA-1: 5eba9683bb32f26072c1ed8616ed36d6e99cd88a SHA-256: a6ad7972426ff99d31edb2a29500516e735a1bb186e4e3b5d9b1ba466cbcc4c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pistant.ru/uplcv?utm_term=wwe+2k20+on+mobile PDF link annotation
    • http://xaydungphongphu.com/uploads/files/laxirexebesisivuteg.pdfIn PDF document text
    • https://artbynela.com/uploads/file/96500077249.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210906030053.pdfIn PDF document text
    • http://portableandcool.com/files/files/buvafa.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec0360c90e---tuzefinevojo.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/wogofiluwi.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/tusewi.pdfIn PDF document text
    • http://tecksco.com/upload/files/83576884697.pdfIn PDF document text
    • https://aromamarketing.md/img/files/50032550937.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/daname.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/94570899216.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161312a0b95fe5---zujavajixutufumekewe.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/nogemodufab.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/fuwiwusez.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-14/20210914065457329619.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109122216487653.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/gimiruzuva.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/87480259817.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/joxamegusiwurelur.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/63147691678.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/bunezaxenegavimegipi.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/xojeneradivomoxodunesife.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_off0000b55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD75 10296 bytes
SHA-256: 3fe529305047c62dd70afe260610ffe3f7e4fdf171b1fbb1fed17dd982b44ffa
font_02_sfnt_off0000e49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49A 16020 bytes
SHA-256: 7e421df5244180fb8ba7cbc80c425ba62fcd763f25fd91e1560aca2890c00d13

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