Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5256ff12e0ea189…

MALICIOUS

PDF

69.5 KB Created: 2020-11-12 22:06:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 30f6c6fbdd4bb7f1cc2f34b355dcaf65 SHA-1: 6a53cc4287112f2c55623af41e3596b2a9d5b368 SHA-256: f5256ff12e0ea189dd52511e77f81cdb290adebf69e2bf3a34b5ffef589d671e
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-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://traffine.ru/aws?utm_term=4+lines+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452862/normal_5fa64f7d43d67.pdfIn PDF document text
    • https://jurexufibemoso.weebly.com/uploads/1/3/4/3/134310147/8648d21d5.pdfIn PDF document text
    • https://jirewolekaza.weebly.com/uploads/1/3/4/3/134387643/tavunovuf_gevumogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462992/normal_5fa587bcd67b7.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/tapukosula-murepizen-gexusuzimawug.pdfIn PDF document text
    • https://talowitutujuf.weebly.com/uploads/1/3/3/9/133999148/5371451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381971/normal_5f959c74d4517.pdfIn PDF document text
    • https://zazejisodixad.weebly.com/uploads/1/3/4/3/134359446/sitoge.pdfIn PDF document text
    • https://vuwejugo.weebly.com/uploads/1/3/4/3/134309576/1711103.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/f69a5d.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/bugaveposamupeke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_5f9a7d42825ad.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/01ed0b5d-5872-4d94-9390-a3d8b8a78717/lejupuruwedobugogesiwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5c082ef-c43d-4e5b-97ac-fe03fac852d6/princess_lideta_zera_yacob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2324a83a-0692-4185-a190-9246e2050d68/nissan_armada_repair_manual.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_off0000d402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD402 4712 bytes
SHA-256: 15b666f42f39ff96f400cc59ac6417c51e79633c608ff5e88a3d0874f83b7172
font_01_sfnt_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 10568 bytes
SHA-256: 3556921598dad657c6d3bb53d8b8388de4a34e159d136252bbfa664b977c5f32

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