Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c072454325240aa…

MALICIOUS

PDF

84.1 KB Created: 2021-03-17 19:24:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d9c05dd457931e6639d3d9bb09d3c564 SHA-1: 167a0023a188c4acb15b1d0d56407dade798c540 SHA-256: 4c072454325240aabcb318a9d307b85527fca6c37012c625dc9a1c030ae62e66
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/123?utm_term=angular+landing+page+template PDF link annotation
    • https://vokefepafox.weebly.com/uploads/1/3/4/3/134333292/buvafesobozav.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/igijfih/58496192283.pdfIn PDF document text
    • https://lewofadexireg.weebly.com/uploads/1/3/4/8/134868993/f34943.pdfIn PDF document text
    • https://cdn.sqhk.co/surixirulol/N2Thugd/tifula.pdfIn PDF document text
    • https://cdn.sqhk.co/zesuxetirano/9tijhce/project_report_on_financial_performance_analysis.pdfIn PDF document text
    • https://cdn.sqhk.co/bisulalu/czH0nvk/72276678036.pdfIn PDF document text
    • https://falibapop.weebly.com/uploads/1/3/3/9/133997194/2bbde31563.pdfIn PDF document text
    • https://cdn.sqhk.co/dilobowuz/GBzhggi/juventus_team_news_champions_league.pdfIn PDF document text
    • https://davikexovenatu.weebly.com/uploads/1/3/4/5/134587521/c679476f0.pdfIn PDF document text
    • https://fekanarikivokil.weebly.com/uploads/1/3/4/8/134884633/c90d6c98b25eaa7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_42ad96e9aec042b3a4594e9cd4b8eb48.pdf?index=trueIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_707117beb29d4ebcb66d3c148eb71197.pdf?index=trueIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_4cf3e0a6bc13409fa2557439c8f05202.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1f394b2-5e4e-41d4-ac91-e8ec19a13285/how_to_fix_a_tv_that_turns_on_and_off.pdfIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_58ef354dbf4143adbcb6e94edaf303c6.pdf?index=trueIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_a2166bfda77446bcb657730e221d1eb0.pdf?index=trueIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_e120ca0dcefb425bbad62f363c55edb3.pdf?index=trueIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_c8a0f902ea034df6aef1a13d27235a75.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2002a911-ab00-4f04-8ab1-9b3410575faf/91142037431.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/89312820923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30160209-a53a-4675-8a3c-64283908de32/how_to_stop_climate_change_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/8926884241.pdfIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_cd3aae136b7946b49bee23f662ff2a84.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukusa/24832150046.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001022e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 5088 bytes
SHA-256: b6746fecd424e0bebc70b57f948d2461bc9bae6f6f0f0ff115acf8c4adb2c712
font_01_sfnt_off00011364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11364 2512 bytes
SHA-256: 085f322c79513b4895e6b5ea00a972e94223ad8acbe441c73456139a31bca323
font_02_sfnt_off00011e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4F 10412 bytes
SHA-256: a1fa6c0b0b9e926ab2a1639d82a6d52e445af81f98b567a34a3767ec5b4f8715