Malicious PDF — malware analysis report

Static analysis result for SHA-256 045f7820beb36f4e…

MALICIOUS

PDF

82.4 KB Created: 2021-05-29 06:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ee3906055bf46e78778956c55184c05b SHA-1: bdd7b20fed2bd6cf0a40095cbf10ad8c3a7f81e7 SHA-256: 045f7820beb36f4e4d5b3836ce2690ca5dd6fc0b60b44bc8a90a3f692367ab8b
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 0.9991

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://bologen.ru/123?utm_term=free+volume+booster+app+for+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448740/normal_60533e8240e7f.pdfIn PDF document text
    • https://jaxebenub.weebly.com/uploads/1/3/4/2/134266064/98ec7088e9d65.pdfIn PDF document text
    • https://dudafizegananif.weebly.com/uploads/1/3/4/8/134864336/8231837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406456/normal_6041cf84639bb.pdfIn PDF document text
    • https://xapabareduvan.weebly.com/uploads/1/3/4/3/134395213/vijegukuzu.pdfIn PDF document text
    • https://zamizugupaf.weebly.com/uploads/1/3/3/9/133999186/baregegajesaw.pdfIn PDF document text
    • https://duxebiforup.weebly.com/uploads/1/3/4/0/134013009/5702953.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505820/normal_5fdf851c11121.pdfIn PDF document text
    • https://jaxuwigoba.weebly.com/uploads/1/3/4/2/134266140/kolebejoliwogo_jopakajeva_memesosa.pdfIn PDF document text
    • https://kawavugin.weebly.com/uploads/1/3/0/8/130874435/03cbf31500f8a0.pdfIn PDF document text
    • https://segoponozumi.weebly.com/uploads/1/3/4/0/134000249/selikoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419847/normal_5fe881f4cc92c.pdfIn PDF document text
    • https://nipawivas.weebly.com/uploads/1/3/2/6/132680981/delifikitebejexo.pdfIn PDF document text
    • https://wizejuxexena.weebly.com/uploads/1/3/4/6/134655833/a859bca48badae.pdfIn PDF document text
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/kikipudiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403818/normal_602c8d27df58e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489838/normal_603573e1a6390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409997/normal_6020116420226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496389/normal_6025715e41af3.pdfIn PDF document text
    • https://kepopuratitub.weebly.com/uploads/1/3/4/3/134378339/2c99eaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_604d9d1782675.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eac023b4-e54e-4d1a-9805-720d72c526d8/2409218481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa9006f1-0649-411b-91b8-f0a3116f17a8/xuxideduzuvifiwuzanuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d84ff10-90bf-464f-97d2-bef7c520c0fb/tiropuwajul.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 5344 bytes
SHA-256: 0f2d08d6780eb991f6d142cb5a9fe233a1a47b165d5fa6a0093adfbcd91305c2
font_01_sfnt_off00011538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11538 11172 bytes
SHA-256: 8f1709361934da65230fd62f67e2ba97359eefec37d144ad5081ca1a3b598475