Malicious PDF — malware analysis report

Static analysis result for SHA-256 54df96173f3f0987…

MALICIOUS

PDF

78.3 KB Created: 2021-09-14 12:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c7ac80ac1826de4c36802d9d55666a6e SHA-1: 7135ef0934ecf928a20d714df60a80baf826dfa4 SHA-256: 54df96173f3f09875fb9ffba73c3221b6d919f6cff7671d04e86e81a59680a90
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=dan+brown+books+bangla+pdf PDF link annotation
    • http://ok-poland.com/userfiles/file/79538696752.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/moraruwexuripaxuxezemapok.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/gifatip.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/rakeziwukon.pdfIn PDF document text
    • http://inphilong.com/upload/files/36909852676.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/zexipazefojigubotonowe.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/53526728439.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/lokude.pdfIn PDF document text
    • https://proia.bg/userfiles/file/806765929.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/77642407589.pdfIn PDF document text
    • https://hoongnau.com/upload/files/dufagodule.pdfIn PDF document text
    • http://technocom.pl/editor/file/lituxorozewen.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/xekakotez.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/zujotidunuzudone.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/ligojoxarabedenokatenukil.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/72758781127.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/woluvamuvurenuvez.pdfIn PDF document text
    • http://aprt1day.ru/file/miludupaxudosofito.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e979a1fee2---21431782560.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/6117862921.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e36b720871---gisagaparisisarin.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/nujelupawatunigukuwarezuk.pdfIn PDF document text
    • http://slovoveri.org/userfiles/fojopumavixabegokidibuzub.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/66207887401.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/dixozefuvenemakifep.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_off0000c52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3E 20316 bytes
SHA-256: 3bde14b838a285f09d4a61fef469e17b4a918d478c6bb7d484f92267a1d5d465
font_02_sfnt_off00011333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11333 10672 bytes
SHA-256: 87b30ab7311790175584db0f4c23d4a0fe35974c1f8c9a25f64f4e76b59a850e

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