Malicious PDF — malware analysis report

Static analysis result for SHA-256 82554cf123f6fef8…

MALICIOUS

PDF

60.8 KB Created: 2020-11-21 06:11:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1160dbeaa898270ee654a3e7d9b79dd8 SHA-1: 158c5a932c4ee927dd5e8e9a492e8d78fb55a0d1 SHA-256: 82554cf123f6fef8e44fbbf447115c4a2e048b81ab15791da7232829df39d078
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 0.9996

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=pink+panther+alto+saxophone PDF link annotation
    • https://xesapidad.weebly.com/uploads/1/3/4/3/134346602/fepafavokupof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382192/normal_5fa90cda9c870.pdfIn PDF document text
    • https://xixivejeb.weebly.com/uploads/1/3/4/6/134603549/mesiriwedugebap.pdfIn PDF document text
    • https://fenawivo.weebly.com/uploads/1/3/4/0/134000055/rekakitoda_javor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472764/normal_5fa803eb3115b.pdfIn PDF document text
    • https://rudanivaxaf.weebly.com/uploads/1/3/4/4/134497940/tarebineno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5f98d4c44260d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_5f99ef903c1e9.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/8096390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385887/normal_5f99590b3b7c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380890/normal_5f99757947185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379968/normal_5f9ea6dda7c8f.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/58dab211-646a-4ce1-ab25-3d7ba8c359a3/pool_table_accessories_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69d11ab7-3c9d-4702-813b-ffe57e2303aa/bupeveze.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/que_es_la_anemia_celulas_falciforme.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_off0000b283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB283 5040 bytes
SHA-256: 98d5b68da90cf0ada0563040577860c6fdd5a6a4dea9a4b5d21027f3e1488fb6
font_01_sfnt_off0000c3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A8 10124 bytes
SHA-256: 576d2f45e8c174d016494d03806701ecba78d3e8618a86e524e167a856f90699

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