Malicious PDF — malware analysis report

Static analysis result for SHA-256 f215ef5003ff613c…

MALICIOUS

PDF

70.3 KB Created: 2021-09-09 14:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 40c4ad6f6a4f4bf42e23271aa5b9ab6a SHA-1: b762d201f1ad7b21ba1e2950b0ed4ee4f7482b14 SHA-256: f215ef5003ff613c864e28c8a3ef1ca7a0cab9f09b09f9ba05a8452c9b31b986
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and multiple links to external PDF files hosted on various domains, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute code, likely to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/2895745564.pdf In PDF document text
    • http://rc-saty.cz/gais/image/file/94287747160.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/75984276783.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/mimexuwasijobopi.pdfIn PDF document text
    • http://xfswchem.com/upload/files/23280494761.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/wuzigomakazebukajimu.pdfIn PDF document text
    • http://sunway.me/uploads/file/080952515171.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/64023481000.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/nogonugoxomepegu.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/bateguxajewopajerogujugu.pdfIn PDF document text
    • http://chieucoingason.vn/files/69357614376.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/19800471225.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/galer.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/94391485856.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/22854407404.pdfIn PDF document text
    • http://cmtsport.com/pliki/99317384005.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/10832712389.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210907021602_27501437.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/30047946039.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/denatuwubi.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210904180053.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/29296343651.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/45648226840.pdfIn PDF document text
    • http://poultech.net/d/files/gigunipopezukuwigopuso.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/sijutofumabame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=words+that+start+with+n+kindergartenPDF 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_off0000b5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B0 14968 bytes
SHA-256: 9f61808c7c339da8b1245ccec8ded627f5811ca567a2793ebd574d5ec0d0ddd1
font_01_sfnt_off0000db1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1D 10652 bytes
SHA-256: 5870943d9370ee0a1182c8d03653edc4afd958ef34d58e4cbca8e3ff25395a04
font_02_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1