Malicious PDF — malware analysis report

Static analysis result for SHA-256 de091e4b47cb33e1…

MALICIOUS

PDF

75.1 KB Created: 2021-09-18 00:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d5ff40bc908a4bb759b16ea46e584181 SHA-1: eaa5653a9f123c9b845a11de0e40146094c638ad SHA-256: de091e4b47cb33e18c8cdba7aea395ac7c63bf0e29d072fc81cc4746c04d6b8f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to redirect users to malicious websites. The PDF also acts as a link farm, pointing to numerous disposable domains, suggesting a phishing or malware distribution campaign. The primary IOC is the external URI pointing to 'infrive.ru'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://infrive.ru/uplcv?utm_term=sopcast+na+android PDF link annotation
    • http://rentbucharest.net/images/userfiles/niripofadixufil.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/senomewokanorixonap.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/28788598604.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/84499698953.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/xuwukezaximalaxanut.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/20087901214.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210916_07F3FA083BB83702.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/vimozagim.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/52496197131.pdfIn PDF document text
    • https://doitoutdoorz.com/file/JPgXEOhCaOu9z3zj.pdfIn PDF document text
    • https://biomisszio.hu/tmp/97683801874.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/xevirokajudugomifipusikof.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/30665834974.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/zaledinibisutotorotis.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/56707688107.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/91990952063.pdfIn PDF document text
    • http://abc-tel.ru/data/File/mirumamuzofubexapupugup.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/35398287151.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/fbd0f01436c11f9671713a37e0fcce5a/60532456143.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/67864042430.pdfIn PDF document text
    • http://iknow.pl/files/file/41234459366.pdfIn PDF document text
    • http://runo34.ru/attachments/file/36797485083.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_off0000c312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB24 17240 bytes
SHA-256: f471794adac2bee22bb6815a089732f7903910fb4b2ea2c1423e9e4674a6fa4f
font_02_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 10404 bytes
SHA-256: c5b3207c9dd128e3637cdb2e4f828530715b28d2417a789e3363e87fa16b4eb6

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