Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99bcacbc38a1a64…

MALICIOUS

PDF

79.2 KB Created: 2021-09-23 12:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 79c034b53066f660c54252551b4b12f6 SHA-1: 8ee1a667d17c04b3f5698b935f89438011bc2094 SHA-256: f99bcacbc38a1a640f929f171bcf2733a0d82b949996cec9eef20674f1bb88cc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to obscure the true destination, likely a phishing or malware distribution site. The embedded JavaScript is likely used to facilitate redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://versobrokers.eu/userfiles/files/33834588746.pdf In PDF document text
    • https://virtualpulse.eu/UserFiles/file/ledirerepifomesalo.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/melabave.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/fa603b8f339828754fd178de68d611e0/xobamudosulet.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/nawagitokapirazoluf.pdfIn PDF document text
    • http://elpijisystem.com/file/wonipodezixito.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/mugifodonel.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/13586739755.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/wotogupowuvimugajujo.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-17/20210917084852439020.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/xudutusos.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210905032409.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/2013409257.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/96990893781.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/5268615073.pdfIn PDF document text
    • http://normel.org/files/upload/file/baruzepagukoraxividi.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/39618369580.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/50375712101.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/wumumivutadivar.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-19/20210919120815828575.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/zipumepunopemalafajikofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+sims+mobile+tricksPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA27 17484 bytes
SHA-256: d7a416d3e061c75fbc0baa2cf654c2ae4304243cc09c07278cd7bb23d1715d0b
font_02_sfnt_off00011797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11797 10424 bytes
SHA-256: a7d6bb37f2e287af655e70aeff037aa4e364a239dbcec8c60a1cc499e01febe7

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