Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0fe3aed3fccdf5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 02:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1312f1f8138634afe039b0e679ca6436 SHA-1: 90caeb5e6870f7ccc80bcfa133e67bcd45ea3a27 SHA-256: ef0fe3aed3fccdf5d9037f6dded37c8681a4d40bfe73a2a6a12b2353b6cdcf8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, further supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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
  • 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://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/grd69hjlgrnpu3r0o3kvsr01k6/gewepeguzonazugolatozol.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb08ab9c6f---88987434129.pdfIn PDF document text
    • http://techmechengineers.com/uploads/zerovelozagopoj.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/91840385669.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/42397655602.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/nisasasovimoxifofovuro.pdfIn PDF document text
    • http://meuseguro.top/fotosempresa/files/69957693507.pdfIn PDF document text
    • https://finliz.lt/i/File/xoketebos.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/xinozo.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/suruverimejajal.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/51456310262.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/32985955330.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/rarimevebopomokuwofojebig.pdfIn PDF document text
    • https://expomediainc.com/upload/file/feloxunudaloz.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/15564557052.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/nogosogafuruvajovedo.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/lolixevuto.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/55834392019.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/36156461148.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/xulaturosoron.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/52555014706.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/82653765125.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/34919556395.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/dotosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=wooden+floor+detailPDF 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_off0000daae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAE 17832 bytes
SHA-256: ec97f52f87e94020c301b4c88a656afcb9dc007d7cfe509aeece625366d8c1b8
font_01_sfnt_off00010857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001206e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206E 10172 bytes
SHA-256: 4b6f52b20844a383812ef7911056629224d7df0b84bb7a454d6dd77c1e8bc362

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