Malicious PDF — malware analysis report

Static analysis result for SHA-256 15170c3944951929…

MALICIOUS

PDF

72.2 KB Created: 2021-09-18 15:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4263dca2368a4fa5bd793a62b1000c14 SHA-1: 16c0b8be308d877235a2b7fd8e004f4e477d5334 SHA-256: 15170c3944951929c962bed2186fdbda97024edf07025d3753084ccacb42c9be
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chcial.ru/uplcv?utm_term=twitch+ad+free+apk PDF link annotation
    • http://productinfo.in/konadnew/userfiles/file/14488411782.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/zidewudififep.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/28085427678.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/95937169969.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/24774816240.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/givajuvapumedusujozenezuj.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/bamutunogesemu.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/kopevajulisapi.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b7a847189---kewufekokuwowefele.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/nanadeduriwow.pdfIn PDF document text
    • https://nexapos.com/upload/files/loledubulebozilasasiz.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/6934053934.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/85499068999.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/visawipuzuz.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/98986790772.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/sexelazerazubi.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/77416295096.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/fsvh94hhdvo9flef74o95odpe5/vejavoramulaviwometejin.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/sujixifedariro.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/fobuz.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_off0000ba64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA64 16236 bytes
SHA-256: 8dc24803b403cb19a6078b64eba69800cb4c1e5ca909635b775da15789df36be
font_01_sfnt_off0000e3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 10420 bytes
SHA-256: af6d96527f9fe7e342c37dc6ca4bb676c084f4105fb6688f65b2b93958f2b09b
font_02_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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