Malicious PDF — malware analysis report

Static analysis result for SHA-256 978b4c20d7af1d5a…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 18:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a830537049395f098cc882de47f0b45 SHA-1: 47ae52f98c9243b047d5266c1c466b156fbb1302 SHA-256: 978b4c20d7af1d5a3d5e60ed94b2aca486e2263e97f3a9e985a5be568833b49f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to distribute malware or conduct phishing. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure malicious links. No scripts were extracted, but the overall structure and heuristics point to a malicious document intended to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://capitolmetrophysicaltherapy.com/files/files/mijigebalurelal.pdf In PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/09e260a19b799b60aff62d45cd45d039/menemutusasefuxujikewu.pdfIn PDF document text
    • http://zzquansu.cn/d/files/70179871339.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/26146741367.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/14927780313.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/fetolajolejudamo.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/ribuzekes.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/xetopo.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/delepixow.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/99190159247.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/vabizubopixukaxodon.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/lekozekagiromoxilal.pdfIn PDF document text
    • https://festacontinua.it/public/file/62469843747.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/87727869994.pdfIn PDF document text
    • http://lovesenergy.nl/file/60211887785.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210912114434.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/kotokozigukawo.pdfIn PDF document text
    • https://zagi.hr/files/naredi.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/52266108889.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/jijiriwosonefomipipasupe.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/c170a3ca5dcd6c80da3a0216d90757df/50000216784.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/16975023348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=minecraft+garry%27s+mod+downloadPDF 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_off0000b1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FD 11048 bytes
SHA-256: 102edc13c9893a7db292fe6b8d3d082e1a568512b2323de46aafbd512324c66d
font_02_sfnt_off0000e39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 17672 bytes
SHA-256: 4b80fd2a6df28cee67e05ade8a5daf65fe06fb175b06de39baff264b0dc8d02d

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