Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5b9314414c0a93…

MALICIOUS

PDF

82.4 KB Created: 2021-03-13 18:29:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5f9520c7784f4cd676af22f1d1b9bd09 SHA-1: 1392125f149e5ed14b968f6e71d38b66b8b96be5 SHA-256: 0c5b9314414c0a93c12812c09b97cab125672df5cb88fe35e3eb5e6f79c8dd6e
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 0.9990

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=honda+cb175+k0 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491723/normal_6001e35086ab9.pdfIn PDF document text
    • https://suxugugufagiwa.weebly.com/uploads/1/3/4/7/134740592/fidikizoni-tezewamefotina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420240/normal_603002b2f033c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456369/normal_603bdf3e24549.pdfIn PDF document text
    • http://bilkaita.space/448730931977calb.pdfIn PDF document text
    • http://tiktoktop.design/guxiravinvqh2i.pdfIn PDF document text
    • http://purpless.vip/mechanics_of_materials_gere_9th_editionaqkrp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372376/normal_5fdbe296cf087.pdfIn PDF document text
    • https://dukazisilibe.weebly.com/uploads/1/3/4/6/134679988/3027689.pdfIn PDF document text
    • http://flymoney.net/sekadipalunigjuwd.pdfIn PDF document text
    • https://labatozun.weebly.com/uploads/1/3/1/6/131607827/fasuzomid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_6041fea37d093.pdfIn PDF document text
    • https://juduloto.weebly.com/uploads/1/3/5/3/135323899/6825727.pdfIn PDF document text
    • http://gtomishebs.xyz/98146551768wlkra.pdfIn PDF document text
    • https://kasasifu.weebly.com/uploads/1/3/4/6/134697732/1169983.pdfIn PDF document text
    • http://olipaka.xyz/nigufejasuroxedifi9y9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_16ba68510cfc4fc9a157228e0d2a1616.pdf?index=trueIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_4468a76233e14bf1b75d12b748d6788f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/takateg/chrome_old_version_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/guardian_good_university_guide_architecture.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/36279592445.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/momaguzegezuwovup.pdfIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_909dfd98ea4344faac53098f8fe28a1e.pdf?index=trueIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_1280978d735544118977f25978f5fb1f.pdf?index=trueIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_54ee1ebd4e3840c59eef4d858643479b.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_off0000ecef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEF 5188 bytes
SHA-256: 265a5d8807c068a938e10f03e6e21170afa4811241c9d1539339c2afb09ea588
font_01_sfnt_off0000feb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB4 11408 bytes
SHA-256: 77a9543719d1e858da9eb38af02525b0d64b6d07dac9ff42c90179afb520e3aa
font_02_sfnt_off00012624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12624 16060 bytes
SHA-256: 713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74