Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88ba46414ecf0da…

MALICIOUS

PDF

68.5 KB Created: 2021-09-24 17:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2405babf8f469b23c6894d73e7de6b52 SHA-1: d8aae416de933e6cb26637a021687eb381fef8b9 SHA-256: e88ba46414ecf0da50c9807be413c2b23ba430625acd1bb0ec2a52527da3f50c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The 'PDF_IMAGE_LURE' heuristic indicates it's an image-only document designed to trick users into clicking an embedded action. The numerous extracted URLs, many pointing to disposable domains, suggest a link farm or redirection mechanism to host malicious content. No scripts were extracted, but the PDF structure itself is indicative of a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://limsurdua.com/contents/files/14229422629.pdf In PDF document text
    • http://sabaparsian.com/ckeditor/files/files/19180994323.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/72764915565.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210910085228.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/tegefiz.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/23027537471.pdfIn PDF document text
    • https://polaria.cz/images/file/fidukixodiwepabaji.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/58622049023.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/21246460408.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/74010092025.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/7259602493.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/614b92457c3cd.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/78566241742.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/gisepomuzu.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/28509625667.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347c6e94782---88118035594.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/nikevul.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/42839165500.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/koliwudokosaxit.pdfIn PDF document text
    • http://change4best.ru/upload/file/71109338421.pdfIn PDF document text
    • http://3q1p.com/upload/file/210901054928918252lp0trki0gfip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=introduction+to+recreation+and+leisure+3rd+edition+pdf+freePDF 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_off0000ae33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE33 14512 bytes
SHA-256: d57486734d305dc551855456595450737ff29b1579b9e84c21147a9a23e466c8
font_01_sfnt_off0000d25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 10836 bytes
SHA-256: 2502f39d0137713440174b17746e3b61500d92e9312112c2d2ee319ca6045f82

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