Malicious PDF — malware analysis report

Static analysis result for SHA-256 9233c76762fceaef…

MALICIOUS

PDF

74.1 KB Created: 2020-11-23 12:18:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6972e90234e5d1da1fa59c444c361045 SHA-1: 157a5032d73c1019aef6b125846043d06d2272fb SHA-256: 9233c76762fceaef19cac05588ce3f9fe90e066c8dfa467e30b54639e4c34808
156 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 5

  • 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.
  • 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://trafffi.ru/strik?utm_term=zin+zhao+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369493/normal_5f957d5520bce.pdfIn PDF document text
    • https://mitixofixomu.weebly.com/uploads/1/3/4/3/134333727/narudazudatumamuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_5f8acd4a2e3c9.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/1486329.pdfIn PDF document text
    • https://moleresudiba.weebly.com/uploads/1/3/4/4/134447347/3150494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443342/normal_5fb5b1bb90286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389084/normal_5fab152256f7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415073/normal_5fa24cc1892a1.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/rekibedafowow/words_starting_pen.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/vewoxanusun.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/80827171375.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/hill_city_mass_choir_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/buku_tafsir_mimpi_togel.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/37354678632.pdfIn PDF document text
    • https://s3.amazonaws.com/moxekibupuru/12499223300.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 4788 bytes
SHA-256: 4657f4b2294130c72bf81eb37b49963a68c3015651c5f4cb9e1309ff5e42e886
font_01_sfnt_off0000e711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 3528 bytes
SHA-256: d5916ca1c5a2d308db5a8be4607ed233309e034d2e5d0b5d155b1c35e5534a7f
font_02_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 11328 bytes
SHA-256: 5430b21bc59fc94377f62d83f3c59692307a9dc1a6c69ce0675b4a7aaee6ebdf

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