Malicious PDF — malware analysis report

Static analysis result for SHA-256 f041d8b3815df3c2…

MALICIOUS

PDF

78.9 KB Created: 2021-10-11 18:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fb5b9df162555089e40775c70047e354 SHA-1: 993ec0af40af8067c412470438267633f4a107ea SHA-256: f041d8b3815df3c280c6e74fc64631ae3d0ba7a5617ec702661f259193183a74
126 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure indicate an attempt to redirect the user to potentially harmful content.

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 https://nomylo.ru/uplcv?utm_term=difference+between+displacement+reaction+and+double+displacement+reaction PDF link annotation
    • http://thewellmanteam.com/userfiles/files/38610371128.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ecdfc9aed3145d45825caf505ea81a7/94502081983.pdfIn PDF document text
    • http://parateam.cz/file/85810472034.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/16541955086.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/xorubakubadugepumupujeb.pdfIn PDF document text
    • http://peak-experience-japan.fr/images/blog/file/vevapasoripediwim.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/87022294991.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/rukugodivunixefewadeviwu.pdfIn PDF document text
    • http://checopharma.com/upload/files/25641751844.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/87478850561.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/pinenafoni.pdfIn PDF document text
    • https://actor-conseil.com/files/file/zaloguxadajasopisixibup.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/dezovekejejaledipuvife.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/32050211994.pdfIn PDF document text
    • http://zeci.nl/im/image/80670954752.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/mimisutovidatetora.pdfIn PDF document text
    • http://gptools.net/userfiles/file/lawinomizerenaro.pdfIn PDF document text
    • http://kite-surf.sk/files/20152491152.pdfIn PDF document text
    • http://podushka.by/files/files/38949328449.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/duvomame.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/wojifumolir.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/fumasejarir.pdfIn PDF document text
    • 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_off0000cba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B9 11108 bytes
SHA-256: 10a3a8077b89b4fc911d7a5f39c65dc29e1f8a37f2c3997e476834c065a2560c
font_02_sfnt_off0000fd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7D 18532 bytes
SHA-256: 578be7c68619aef1c22a315b1772de28a8b08684fc44d1575a0be6c2cff82efb

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