Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39415d444cb42b8…

MALICIOUS

PDF

74.2 KB Created: 2021-09-10 02:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3d21d1b21f15891eb10b19c0367f59be SHA-1: f38d88827d2bf0313477f36191c19c3bec6129bb SHA-256: c39415d444cb42b81f86cec9e31c64ea72b7d127d022d45d86f7b85d4e126496
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=notepad%2B%2B+compare+plugin PDF link annotation
    • http://straps.by/ckfinder/userfiles/files/tokapixabizapivig.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/kukenenuxatinokivotebenoj.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/81502791088.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16134d73d36710---34067905769.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/59729415143.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/tutipadozipatevikopileg.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/bologonokajijuvo.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/90355797587.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/61384260133.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/tilawelanutera.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/vanaxavudovenogid.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/noziwujadofazonitogob.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/sikuwegukoxofuzavipa.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/naratulu.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/kafuresiratebevezu.pdfIn PDF document text
    • http://staropolski.net/Upload/file/vexelutanazagagezaj.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/2523367411.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/50661016350.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090518022756.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/niwarorowit.pdfIn PDF document text
    • https://grouptm2.com/contents/files/94768402144.pdfIn PDF document text
    • http://hotstamping.pl/files/file/93940956542.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/53354753419.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_off0000bfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA6 16792 bytes
SHA-256: 6c14a2191a74c874529565136c3749699cb6f8535ebfa9ab9fab742033eaea03
font_01_sfnt_off0000eaec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 10764 bytes
SHA-256: 6ba9afe0ccd8f7185655aa95f6a4188de102168363f3ecf00da881844a6f4be6
font_02_sfnt_off00010368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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