Malicious PDF — malware analysis report

Static analysis result for SHA-256 8522ff91b9754225…

MALICIOUS

PDF

66.5 KB Created: 2021-09-26 15:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4f47872d1c5b4a784c35764c96f88f11 SHA-1: b75ed371d2a30af26b9c251a2161c477f2cc482c SHA-256: 8522ff91b97542258db4dc96c1a0e77092deec7514b14722203446b77deadb8e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the high number of external links indicates a primary function of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3755

Heuristics 4

  • 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
  • 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://smidgel.ru/uplcv?utm_term=turn+on+data+saver+android PDF link annotation
    • http://stark-tools.ru/images/uploaded/tixoxotavuxe.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/32224950276.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/fejalizuwuvawemoxev.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/wesuvibodimosepelalojuw.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/sutukoluzinanixotew.pdfIn PDF document text
    • https://oz.korytnica.eu/data/files/wugejozaluxixako.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/widezasumo.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/levabaravujukasunofexi.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/vagefowit.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/3019330719.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/86087875176.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/gunavagiza.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/73751382634.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/88675331806.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16149b32d3fd0b---834484371.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/rosexomavuse.pdfIn PDF document text
    • http://network-italia.it/file/859190956.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/35678311331.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/17864571189.pdfIn PDF document text
    • https://kaimano.it/file/butipakigirewowezu.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/80510508632.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/nepupatiloropodixaju.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/3141053050.pdfIn PDF document text
    • http://healthywithhart.com/res/file/xeduviromonado.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/nuseduwurasetutok.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///xadurolapiziju.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43D 18344 bytes
SHA-256: 430396f2d66bfce6ea43ec7272be3a2f7b391a588677368a9874276a9266eeac
font_01_sfnt_off0000e349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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