Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5729989cee4a509…

MALICIOUS

PDF

93.7 KB Created: 2021-03-31 22:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6e8d693c351911e0fbc18427847a0b02 SHA-1: 54f18b0ba5b5674df84c807c7df9fd2d60b5ef3f SHA-256: e5729989cee4a5095da19ea2a78c010f3be3c1787665c18645dd5689472cf171
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/123?utm_term=bitcoin+miner+robot+mod+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376879/normal_5ff137c7ad8ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497081/normal_6039d083b6237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488569/normal_60371bf39db80.pdfIn PDF document text
    • https://zefisuket.weebly.com/uploads/1/3/4/8/134868467/dunez-xenopopowek-wojozidetefuke.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/dyELifO/24297862156.pdfIn PDF document text
    • https://cdn.sqhk.co/tefazaturar/bjftajb/vewisev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415936/normal_5feb495514b2a.pdfIn PDF document text
    • https://medowiwufaj.weebly.com/uploads/1/3/4/4/134480571/6240283.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415327/normal_5fca43fc4ded8.pdfIn PDF document text
    • http://vinakubos.22web.org/philips_aquatouch_razor_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/jbnXcib/one_word_meaning_mastery.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377381/normal_605c41be2845d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420431/normal_602ae7cc74567.pdfIn PDF document text
    • https://cdn.sqhk.co/mabisurud/ijOyhbQ/92277651402.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/gggdhbl/bazebikipoxemorakot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475716/normal_5ff50b21e9e50.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_fac7d7b780254aa089ccd8400d2eee55.pdf?index=trueIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_a4b190ecdab14cac8689e5c740f32f6a.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_6c02c33738c54c3b83ac1318246ca014.pdf?index=trueIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_027ffd9767214ae9a40426c4689814fe.pdf?index=trueIn PDF document text
    • http://vaxazovalijulut.epizy.com/tuxavetokozibo.pdfIn PDF document text
    • https://765a5d72-5774-4a4d-a421-5c90307110ba.filesusr.com/ugd/f2a868_3d313988d6544750b43ff3aa9eb8548f.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 5264 bytes
SHA-256: 300872bfd8e42c9c7950e0d3aaccd923ed608b5c4581162296e7099681e45a2a
font_01_sfnt_off000104a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A3 11396 bytes
SHA-256: a485569caaf7154d689228fb69509cdddcf871a61cfea9ad64bd64c216d04c38
font_02_sfnt_off000124b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B6 16344 bytes
SHA-256: 0d38e10c8be59fc73839e968afc9d45bed4f4c883b8f22f4fb19fbc61a5d2a2f
font_03_sfnt_off0001526d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1526D 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848