Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e4b930f26e45db…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 18:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ebf9349fafd945cc3cb8977afd4c5297 SHA-1: c90f50a4c383801dcda37195819fb9288cd00f56 SHA-256: 11e4b930f26e45db849d765eaf8b3f09654fe39ca7eba1065cc589f678bac0c6
134 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It also contains numerous links to external PDF files, many hosted on disposable domains, suggesting a link farm designed to obscure the ultimate destination. The embedded JavaScript likely executes malicious code or redirects the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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 https://gemma.lucien-sv.info/uploads/files/61340cfea30a9.pdf In PDF document text
    • http://rideco.hu/upload/file/33140396345.pdfIn PDF document text
    • http://pnalog.ru/images/file/xogaloxosogibejituvagomut.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/kezaxaxodeniputolobonowe.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/55366422666.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/29818812385.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/72839157921.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/rekukelawegafikisin.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/41377062345.pdfIn PDF document text
    • http://hopkim.vn/upload/files/14137806134.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/wugumomizafizixunuxag.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/wariviwaxofixita.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/taledavur.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/52657148335.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/sapoloki.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/lasusowusoxomolajoxowafox.pdfIn PDF document text
    • http://skncn.com/u/files/zumavipikoxuzozeromu.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/87733080147.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/26012923968.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338a6935f43---kelutobuzar.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312a8aa4dfc---tapebajuzidipiwaw.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/43205745362.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/vebaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=financial+analysis+sample+pdfPDF 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_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 18180 bytes
SHA-256: e4da467089476d69251e51deea38fe475e694eec0d58c4992b1e5bb24309029a
font_01_sfnt_off00010ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE9 10552 bytes
SHA-256: fb941ab869c15d3aafb2ed1aaa89a7fe7c8e6adea55d623127e6eb7b976e7011
font_02_sfnt_off000124e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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