Malicious PDF — malware analysis report

Static analysis result for SHA-256 955eebd3b92ef4bd…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 12:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 627e47b3a2ba90b0697af278d0734997 SHA-1: d4b5007a1fda6d3ba0450674ecad654df46c1444 SHA-256: 955eebd3b92ef4bd3c943cfbe6a29b4e149b8d90a29aea4d999c2040ac6b1eb3
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest an attempt to redirect users to malicious content, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://js-space.de/userfiles/file/buxodar.pdf In PDF document text
    • http://loxocongnghiep.com/MINH/user_files/file/remev.pdfIn PDF document text
    • https://sealskinz.ru/files/file/64756755514.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/nuwatenedozega.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/62329590220.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/tobot.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/52798440468.pdfIn PDF document text
    • http://nineslash.com/user_file/file/78779081156.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/61152271047.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202192663468183.pdfIn PDF document text
    • http://peoplefoster.com/pliki/76447704982.pdfIn PDF document text
    • http://catwalkexotique.com/userfiles/38342866472.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/fuliv.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/38705425017.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/wubovovagixafuvalifa.pdfIn PDF document text
    • http://foxadv.net/file/fiwonijug.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/nonuponikowexepuderif.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/wixobuw.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/59970900879.pdfIn PDF document text
    • http://tulga.ru/editor/files/15364289754.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/35932601713.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/somux.pdfIn PDF document text
    • https://securitydm.com/slicice/file/24032306262.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/tfgjg1b572vj2lf2a68fsn92t3/fevigojave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pubg+lite+official+download+linkPDF 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_off0000b0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B5 14980 bytes
SHA-256: 480e3edfb3b06432630911b42297801e459e474fb20827bc0a2b3372c34587b8
font_01_sfnt_off0000d67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67D 10804 bytes
SHA-256: 081c5592af184bc438032bf20382fb574f9d8b28298d4ad8209d21635f2e05a4
font_02_sfnt_off0000ef5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1