Malicious PDF — malware analysis report

Static analysis result for SHA-256 d01b067513b70012…

MALICIOUS

PDF

77.7 KB Created: 2021-09-21 17:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 57bdb22e0a4812786c2fb19811152b5e SHA-1: ab849f0967f23f1426758c9d730a3ca04e4cf46f SHA-256: d01b067513b70012f005d281085345d95685229a15b60aa01db8ba84287f5938
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, directing users to other PDF files. The presence of numerous unknown URLs suggests a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://congseng.com/uploadfile/files/24741017033.pdf In PDF document text
    • http://vom-ragnaroek.de/uploads/file/9234819101.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/jolikizijo.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210901163805.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/lapug.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/63846390312.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/11400780404.pdfIn PDF document text
    • http://ailizia.com/userfiles/82499706427.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/masewekibewejowatazi.pdfIn PDF document text
    • http://maksimetall.ru/files/29881386868.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/xujuval.pdfIn PDF document text
    • http://savemaxint.com/files/file/fifiketogenobofogofepif.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/45093348758.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/30974466805.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-12/20210912225700796564.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149b8ad81ace---xavisixebatimibibexunokaf.pdfIn PDF document text
    • https://alariel.be/userfiles/file/defowi.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/86623939781.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/42204635136.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/18820766355.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/ninenoxarevovivube.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/82557884403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pdf+to+word+free+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_off0000cd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD40 10172 bytes
SHA-256: f1743530a3b94bb365764aeec33adb9d76dbae134c2830afe9785d56cbf92562
font_01_sfnt_off0000e435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 17764 bytes
SHA-256: 813f3a2150585040112b2a754ff4e8ed1b9d399e999d0780af0f719d4e039f08
font_02_sfnt_off00011110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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