Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a609b01bc8ed35…

MALICIOUS

PDF

76.1 KB Created: 2021-09-21 01:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 084e58b66be58a88ef0b23b857d0a5a1 SHA-1: afc1f16b3d1add96932e97633681c8d2d6fa394f SHA-256: e9a609b01bc8ed35d5ebb3c6f4e7ee871b3f432f44963ae1d926400d902e21c4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF's structure and the presence of many external links suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=the+pros+and+cons+of+social+networking+sites PDF link annotation
    • https://hongdung.vn/ckeditor/images/files/kezekigalesi.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/pajilazamar.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/88428263844.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/55954142341.pdfIn PDF document text
    • http://citranco.com/users/files/3717859686.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/93883874622.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/36269220710.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/90947255435.pdfIn PDF document text
    • http://sergeybazarov.ru/file/39699322261.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cda52d95bd---sanilenemopibodoludu.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/47540902680.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/xalelomunalofebinozexezug.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/kesewomav.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/vipikutimotageka.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/18469072940.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/16415130393.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/76118891855.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/34713196291.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/libuximeku.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/88862362845.pdfIn PDF document text
    • http://envigest.cz/upload/file/jupiwanujazigidawa.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/xaxolemezidadeketukulis.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/venag.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_off0000c5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE04 11040 bytes
SHA-256: ecaa74469db3fb7b3257d2e09996efce4936a7edfda48304851b6a40b5e40fb8
font_02_sfnt_off0000f781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 16496 bytes
SHA-256: 69e0fe585149b6b2e1274d5a2af618400770dbdcf441ce15930b15da0f88b977

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