Malicious PDF — malware analysis report

Static analysis result for SHA-256 20176e4e20408ae6…

MALICIOUS

PDF

80.8 KB Created: 2021-04-05 02:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f5f8621f883bdd95f7a9915ea1b41a61 SHA-1: 4ee2e3648cffaf19213ffbf74eeff0eb71eccc4d SHA-256: 20176e4e20408ae674a0df0aaca3657aefce82f134b25e79e59ac3632044caa7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/wix?keyword=john+emulators+nes+apk PDF link annotation
    • http://poroda.site/sig_sauer_p226_mk25_reviewi1ijj.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/zewuxon.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/ifEhhlp/12259835361.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/ZdgdjhG/58593966984.pdfIn PDF document text
    • http://xevijuwidenuxet.mypressonline.com/biosynthesis_of_catecholamines.pdfIn PDF document text
    • http://copyrightshelpcenter.com/dymo_labelwriter_450_twin_turbo_troubleshootingl1qx3.pdfIn PDF document text
    • https://feboratopaw.weebly.com/uploads/1/3/1/3/131383734/3e3040d102f1.pdfIn PDF document text
    • https://cdn.sqhk.co/sesakiwewe/Whihfif/52088663933.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/o2qhmlM/menawap.pdfIn PDF document text
    • https://cdn.sqhk.co/litonesi/hdhdKGH/wedoj.pdfIn PDF document text
    • https://gosawopidelogeb.weebly.com/uploads/1/3/4/7/134714887/2230681.pdfIn PDF document text
    • http://pasiworuwiwoz.getenjoyment.net/ratezebekiraworezakuda.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/japotirobi.pdfIn PDF document text
    • http://hotsales-com.xyz/yellow_soles_of_feet_pregnancyhkumt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_594238f235354782bf19012ef125d566.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_30e19afd9c0b42f0948456b86585c4e3.pdf?index=trueIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_c258aa0e96334a63a9e64f8901bb9f62.pdf?index=trueIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_ea0931cb88ab4835819fdd7c4b7e3d4c.pdf?index=trueIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_9323f9d9b06244098be276795eedac6f.pdf?index=trueIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_ddd373fb04244b33a0543216a184c4c0.pdf?index=trueIn 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://scripts.sil.org/OFLIn 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_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 5112 bytes
SHA-256: 90fddc35ff1f4ee94072c40abcaff395fe103928c5790ccd3159d68c4aaba715
font_01_sfnt_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 11516 bytes
SHA-256: 011c0df78af70b9b37429a756c69748cbe498bac5c28f344ddca19541587ee8e
font_02_sfnt_off00012154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12154 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848