Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b9acc7815502ab…

MALICIOUS

PDF

69.8 KB Created: 2021-10-03 05:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4d3b71fdd593041a360dc60eefcb0c51 SHA-1: fa2ff4c55ee6797a9ef23db437264658583d2687 SHA-256: 92b9acc7815502abdc8af936e76cfe20909200c36d51cd4b578642fdf55d3b70
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs indicate it is likely intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://infrive.ru/uplcv?utm_term=i+can+see+squiggly+lines+in+my+vision PDF link annotation
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/pipenemexugajifutivabuve.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/wajefovalarofor.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/29835472443.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/rekukaj.pdfIn PDF document text
    • https://ifunb.com/shopadmin/upload/files/89221661222.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbe92d025---37921324375.pdfIn PDF document text
    • http://nfc.soo.jp/file/lodamojesu.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/damov.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/jitararub.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/26860802769.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/dagidivovevomerasuda.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/16453586274.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/naveno.pdfIn PDF document text
    • http://badgerhillfarm.uk/60149490902.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/15829235685.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/25180798376.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/36349726025.pdfIn PDF document text
    • http://rogatka.osieczna.eu/userfiles/file/72693083687.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/zeteden.pdfIn PDF document text
    • http://orenprom.com/img/account/file/26534648224.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/88753675925.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/74420194568.pdfIn PDF document text
    • https://777mto.info/contents/files/wixazilubovubebokiv.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379a9f48a3b---26227402862.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/99010663486.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/24634983751.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_off0000b1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0B 10752 bytes
SHA-256: 3dcaa6e3aa33a21a3f6207ca85966dfa9d279ca294c7517f00baed33e2e968c4
font_02_sfnt_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 15368 bytes
SHA-256: b8deb51cdd90ad0f81647fc51e8d409a6e6b6052060fa97b633fed15e858f2a9

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