Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af481dd1154fdce…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 13:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8ad01e7f865becbcf19caa4018112f24 SHA-1: 15321c7675dc24b4295746b7130f69cdb5d11832 SHA-256: 0af481dd1154fdce225442e50138c87d15a8139a1c3c903b83518fd7ef4f2356
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file 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 for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=gta+san+andreas+download+obb+data PDF link annotation
    • http://xlpe.net/Images_upload/files/mogupawakowapuku.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/zobekixakunumaku.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/finojaravonow.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/nolujupomonirojukatiput.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/mawadofokofek.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/95466584246.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/xudoxemigixometidako.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/16024396031.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/97252419727.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/789611606.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/92650105281.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/sasizebuka.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/47074399206.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144824344b06---34063668874.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/tipofitabavarenutudogovex.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/24506523537.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/18498035385.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddbb8a1512---28036388601.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/wekufexiseragimopopiv.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/gekuvilolesomikupedagax.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/jejelefomixugisafoga.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/7563449458.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/kavepe.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/21455799958.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_off0000dd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 17520 bytes
SHA-256: 9e66fef5deff2ccd4047caa4d32166f073b7504f199ea9f6d8ad1fe2cde2ea21
font_01_sfnt_off00010a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001229f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229F 10416 bytes
SHA-256: cfdbc2b6d41cd4e216eeace888a1c38520813b4b6712959b055d4c2565370705