Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7980c335ddeecf…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 09:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a0508e6ab2aa95181d8a432e131b983b SHA-1: 567dfdb20b3bba820cd143d9e51f1cdc27ec4769 SHA-256: 3f7980c335ddeecf6517c6d3ea1691a1a7d70ab02feff6d505998f9508a44b73
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links to potentially malicious or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://firsatoyun.com/calisma2/files/uploads/jepewili.pdf In PDF document text
    • https://chrmglobal.com/userfiles/file/povukutexopoxod.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/subuvukuke.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/29009081026.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/44130857443.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/remusunepozifomi.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/tavobafukod.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/zebowejurasibanuxa.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/xefarorul.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/sokodute.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/4c00b4ff75e7e66f0cd8a75c00f9cb58/tumusuneked.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/30237430718.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/57533035011.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/pobeli.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/83995320207.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/21995681677.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/25055935417.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/87605345143.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/55805731134.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1501l47i26kvc0vk73e2h8h9r6/43711763024.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/80565528790.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/gamopafo.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/62202587245.pdfIn PDF document text
    • http://spiregene.com/image/files/20210909_125653.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/31084864314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=dual+operating+system+windows+10+and+linuxPDF 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_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 19272 bytes
SHA-256: 815d3c00b257803c19ad227e65f71ebcf53583d52eeffe1890039684bc976bca
font_02_sfnt_off000126c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C4 11312 bytes
SHA-256: 1773fdbdfaf96c70349a6a4107aa0f22edfa28b984f3ced9fcc8dc872e771f72