Malicious PDF — malware analysis report

Static analysis result for SHA-256 729cff6120945969…

MALICIOUS

PDF

84.7 KB Created: 2021-09-11 04:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 00544c207c7fe3020c407d4eea40d67b SHA-1: 0354dededb3082df459f26bc98b19509ae7214c0 SHA-256: 729cff6120945969f525231eabef0b5084bc67cfc5f1b49110d7374438a304cc
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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://logiccpacma.com/ckfinder/userfiles/files/54679072597.pdf In PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/68248625693.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/65193701647.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/tamumidamebawojaxurumu.pdfIn PDF document text
    • http://ccshecea.org/upload/files/40556641247.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/tebitefazagokow.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/mokunilekuwik.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/zopofonabemef.pdfIn PDF document text
    • http://klinok-saintp.ru/files/92884277558.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/diminibumebaxu.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/2de1db7f6f8609dc8395a6fb19a5079f/posevom.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/44539731008.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/zedalofonotugufepo.pdfIn PDF document text
    • https://strechybenesov.cz/content/59057600353.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/7295864176.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/41430706166.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/neriluzasulufabo.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/24607706366.pdfIn PDF document text
    • http://annabarons.lv/files/files/4997589313.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/dekuv.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/zepodugu.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/68774573575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=best+battery+health+app+androidPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 10796 bytes
SHA-256: 73f88a6811b69f00797bb3907b5255fb0882f7592a5bf3dbebd898cab873d963
font_01_sfnt_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 17168 bytes
SHA-256: 2f8c9e9e90a6bb34c7ee598f6813c2bb7a5d676f74b4c29ff0238d68c3945dbe
font_02_sfnt_off00012d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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