Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93e0d12b29eabeb…

MALICIOUS

PDF

71.3 KB Created: 2021-03-19 19:18:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c64cc7ce6a4776554a0fb7db8929e4bf SHA-1: 52e4c4f1a27402b947a43a45eaaff6cbb3d20c20 SHA-256: b93e0d12b29eabeba783c1e26fe23e3419b9cb78e698df2ed4fda5d48f3f381c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://lozipotod.ru/wix?keyword=ap+calculus+bc+notes+pdf PDF link annotation
    • https://cdn.sqhk.co/fojufifef/Hxjigic/bitilazozibaxafozila.pdfIn PDF document text
    • https://cdn.sqhk.co/divoxisig/mrBRVih/70630238161.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/369fc.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/petegipuvupa_jijome_bovizo.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/Fajamym/36470690244.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485162/normal_5fffac8c45992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463034/normal_60312d2c1eee2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445750/normal_602c2dfbdbbe7.pdfIn PDF document text
    • https://lopiranurepo.weebly.com/uploads/1/3/4/7/134735856/57bba2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504922/normal_6041d3914b116.pdfIn PDF document text
    • https://pudodogefelareb.weebly.com/uploads/1/3/1/6/131606347/zuzuraper_vabonatidi_tawede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471083/normal_6022920e97de4.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/iifvhb3/63772648743.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://75edee45-cd08-43cb-a752-0c33e5c2343f.filesusr.com/ugd/a7c173_c5fcd23784674ed09b4a9d8db5c3190d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kaxukok/gagarovilanibojojo.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/66203317899.pdfIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_15b3e6ac5f3f4736bec68edae53ac987.pdf?index=trueIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_2c271561b10c4a50ac0c1ef70b1d00e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/nusapafovavofawuli.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/86505376348.pdfIn PDF document text
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_37062232ece24b4c8e8eacc40cd44e6e.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 5184 bytes
SHA-256: 258c6ea00d20b76d9972a57c313aedaa8f0e8cba0ef368519d540b278b78cb10
font_01_sfnt_off0000ec35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 10692 bytes
SHA-256: 56f340759bf2bba03f7ebbbfdf0f24c9349b49f663d1ca5ad778200e25ec8229

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