Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e17ca259fa73599…

MALICIOUS

PDF

82.6 KB Created: 2021-09-24 08:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 875afe1014363bf4cbae2b9e5043761a SHA-1: f9a81d56aaea698b0f478f84df39678a809903f3 SHA-256: 6e17ca259fa735996290d4ab732a62d1a6718db82da1e7c0135de9263648842c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded URLs point towards a spearphishing attachment attack vector. No scripts were extracted, but the presence of external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=dr+jekyll+and+mr+hyde+by+robert+louis+stevenson+pdf PDF link annotation
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/jilelixugudew.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/dosigodogevurepemem.pdfIn PDF document text
    • https://campermagazine.tv/public/file/7570922779.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/wiwovunonefunuvoriwolapuw.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/79107423915.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/dokorokukubo.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/zalukomufujageli.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/80687521386.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/5535361257.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/74604107988.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/rewakexufozuruwox.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/41762453474.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/75271109959.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16146edb8da13b---lufibovu.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/soxupagexebimiva.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/92342957537.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/mabofakomibujiv.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/waboxatipobunumenodajitu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/htgg8q8o75c368r8mktshpq048/xexafovezumeru.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109232136102698.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/fuvalemebogu.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/59761488600.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_off0000daf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF7 18124 bytes
SHA-256: 28cda6db054f5740e03b33dc27fc835b8cec737c3b0d089cca6fe9f6e8095046
font_01_sfnt_off000109a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A8 11404 bytes
SHA-256: 8f151845e295c7e33571b07ad5794f2a1f519d4a44b3dd95e38f64ec52533f21
font_02_sfnt_off00012422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1