Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94750db47d6f847…

MALICIOUS

PDF

73.1 KB Created: 2021-09-17 15:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 268e737d48ca298aa822590780002778 SHA-1: e532336b6225912d13d96e2c8ce0b576bc726622 SHA-256: a94750db47d6f8473db133f394ff6f982d61949ee18b3d303a60760042a807c2
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 an attempt to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://med-os.com/user_upload/file/46472263902.pdf In PDF document text
    • http://tubesealer.com/uploaded/file/4657281436142369a0225e.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c051aef24779ec76cf6ebdb5549255f3/81402440539.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/kozifi.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/jolotosozofanefusawo.pdfIn PDF document text
    • http://apvn.info/userfiles/file/pukiro.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/wejopejexukojova.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/rekiredipowakulixumax.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/83962912063.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/50217375549.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/laxisufulunubafetuve.pdfIn PDF document text
    • http://dogable.de/userfiles/file/nefozobebupewiteros.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/16945589820.pdfIn PDF document text
    • https://pepsima.biz/files/file/684554735.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/31642665984.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/nitekizogutokurabaxotuf.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/81597400761.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/vufogalugijuk.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/35213296875.pdfIn PDF document text
    • http://nfc.soo.jp/file/nokefamemo.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/65605560921.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/zosuvojonikako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=watch+drag+race+season+13+episode+3+online+freePDF 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_off0000b829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB829 17204 bytes
SHA-256: a86cdc077ffdb560c5bc3f950389963b9b35ce1588be053f577f1e6094fae506
font_01_sfnt_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 11116 bytes
SHA-256: e6e3302e19f21cf1dd951d9eafb7166d41aa88c60858a728213a9a3d6ec2cc14
font_02_sfnt_off0000fe58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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