Malicious PDF — malware analysis report

Static analysis result for SHA-256 823fc82c9838dcb0…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 00:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e00292ada6bb3c346b5df90f5cedeb7c SHA-1: 05f104feaa96d1038e79c91189725148adc2c209 SHA-256: 823fc82c9838dcb0010fa9d600db6d68438000323d7f176ee257a8c404c65235
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document contains a large number of embedded URLs, many of which point to disposable hosting and utilize UTM parameters, suggesting a link farm or phishing campaign. The presence of numerous external URIs indicates an attempt to redirect the user to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=chemical+properties+of+period+3+elements PDF link annotation
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ced3b37d64590f68f1ac944c1d5ccdd0/razurefafitasi.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/92900710142.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/dadawekabilegosa.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/52049192462.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/winogenaxebogegajame.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/17014035189.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/pajimewojajoje.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/22240902269.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/85485957661.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/41633059011.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/74335907996.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/lipudorefowapataxaxugeb.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/16083018464.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109191020491888.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/xabaniv.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/32068079356.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/56132181237.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/68370797094.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/xopuwajusadokinudomo.pdfIn PDF document text
    • http://matras-devison.com/upload/file/61786298919.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/4448827429.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/60165290153.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/gobaranuxibejefuli.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/63438400271.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_off0000d771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 11088 bytes
SHA-256: e4344753f57980be62eecc039c1aa2e0be029f84aae1fba49bf38dc952aa9355
font_02_sfnt_off0001092d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 18128 bytes
SHA-256: de382db6d3a864dfa3b2535d64aa2092ba994ac5b2b0bf060ab92fee0a6633a7

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