Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7364b545b870242…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 11:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 817133f76dc0ff06a4107b8b75c468a3 SHA-1: 125daeaa27e9f660ba70d66d6b82f1dfe44e5208 SHA-256: b7364b545b870242a0c6415b3969f096981b34f2a055eac8f80e82a125b3a0c1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8253

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://queure.ru/uplcv?utm_term=keepsecurity+antivirus+booster+%26+cleaner PDF link annotation
    • https://konferencii.ru/js/ckfinder/userfiles/files/81408924068.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161475cb8ed1fc---22552731873.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405034020cb---waboporusufuxi.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/raxogaxome.pdfIn PDF document text
    • http://apsons.eu/files/file/kizojogigeto.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/89235847423.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/75225426518.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/17047092637.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210925081520_1380237102.pdfIn PDF document text
    • http://steinemann-ag.ru/41185868794.pdfIn PDF document text
    • https://ivanamihic.com/files/losopabijopabumetedokamok.pdfIn PDF document text
    • http://speckrepej.com/upload/file/rofadatubesugalexej.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/sabobofudavigi.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/vifubaneje.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/wezifariperadapi.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/dibomojebajidozeki.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/85808078657.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/7516374768.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/68527041464.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/72467088311.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/62493293614.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/fipusademe.pdfIn 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_off0000b2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DA 17432 bytes
SHA-256: 1d2b549726ead569a3750a6b817df3e0c096b8e67aa13fe7aef61fb707c0e92f
font_01_sfnt_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 10732 bytes
SHA-256: 55246f5a52a2c8934d48221a218ffa97bfd0b1dbd98ce721d95cdcf4262e7f0c
font_02_sfnt_off0000f830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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