Malicious PDF — malware analysis report

Static analysis result for SHA-256 c558da012a53ded5…

MALICIOUS

PDF

68.1 KB Created: 2021-09-23 16:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0b324c84069312d18f6faa3290daaf00 SHA-1: 310d9fd03b0c817800ce0c099c606b6368cbe65a SHA-256: c558da012a53ded59537f18de8240a724d5ae32403090bc9e88fd538de6f7cc0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as a phishing lure due to its image-only nature and the presence of clickable actions directing to external URLs. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and numerous external links suggest it is part of a link farm designed to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://philabc.ru/uplcv?utm_term=download+free+movies+on+android+device PDF link annotation
    • http://soleilboo.com/images/uploads/files/wulofumedavobe.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/rujobiketomuxiteb.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/36239646319.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/35809683351.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/xefusuxe.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/16527372756.pdfIn PDF document text
    • http://www.siposferenc.hu/html/jakuba.pdfIn PDF document text
    • https://kermanrooz.com/img/files/fusom.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630969036.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/78365639360.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/tinesomigevewewosezuv.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/8177882111.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/zogemebavitowirixiz.pdfIn PDF document text
    • https://vleek.com/uploads/files/3863069165.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/94518098804.pdfIn PDF document text
    • https://glozor.com/userfiles/file/25718174702.pdfIn PDF document text
    • https://blv.by/upload/editor/files/zujure.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/xomivulajamutuluwux.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/wakodutenixarovaro.pdfIn PDF document text
    • http://wych123.com/upload/files/55358554880.pdfIn PDF document text
    • http://skrn.cz/pic/file/godemux.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/32634681037.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_off0000af17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF17 14060 bytes
SHA-256: e073725d33e699b2cd28c1eb5067ef2ebaef2b44ca740763879f5d1f888295b6
font_01_sfnt_off0000d215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2C 10692 bytes
SHA-256: 7eb5c01bfa92841bed9aca5ac343237786c2e926a1310a48206fe55eede07498