Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a0922d6be24d39…

MALICIOUS

PDF

63.1 KB Created: 2020-11-25 03:41:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e151982f4c420d16f85d297e3843c41c SHA-1: 90c0601584c89a437d4cd92971b744ecb4c16394 SHA-256: c6a0922d6be24d39803f5d7f674fe84dbcf3516dbb3691218cbcf5c7fa8e2fb1
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 0.9998

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://trafficel.ru/123?utm_term=grammar+composition+handbook+pdf PDF link annotation
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/6589686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393035/normal_5fa3e65b26c8d.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/jolol-bisijimerukuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375076/normal_5fb2b10abda5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417205/normal_5faa1e36d68f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5f97715e52a3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_5fa1f36cde928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378618/normal_5f8ab9e4016f7.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/fbe3d7a430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402960/normal_5fa3987c3a3df.pdfIn PDF document text
    • https://fikamuvereza.weebly.com/uploads/1/3/4/7/134754658/vurabori-fakilotijev-zunotiteri.pdfIn PDF document text
    • https://sugevemaketajes.weebly.com/uploads/1/3/4/8/134873201/pobibojubi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/purufiz/isa_international_standards_on_auditing.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/case_580_super_m_backhoe_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/discord_mute_person.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/xarovazanigik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f02c0fde-dde2-47ce-bdb0-7fcbf4a49097/55035240589.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_off0000bbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE1 5596 bytes
SHA-256: c9f705064e096800fa6f34e9cdb6b3cb8f31579094d8a97350abaff5f616485f
font_01_sfnt_off0000ceba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBA 9524 bytes
SHA-256: 48dbbcac057cd77de1b581786a8228a56b57437520ea84bb2670ab1c3e78b7e6

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