Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5356a05bf95f28a…

MALICIOUS

PDF

70.7 KB Created: 2020-11-16 21:45:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 059ea27e9348e184543d4a9ec7f5e455 SHA-1: ba3f8a9cd42ec75a8c20e7f5b0d124f77dc63f8b SHA-256: b5356a05bf95f28ac200f4f4a616ec2c8af6a672aca488f84be21ec28e15457f
156 Risk Score

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-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.
  • 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://trafftec.ru/strik?utm_term=gainage+course+%25C3%25A0+pied PDF link annotation
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/7e7a39.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/7944789.pdfIn PDF document text
    • https://lisewukalog.weebly.com/uploads/1/3/4/4/134435391/velutiziwata_gipozisa_gududedijelema_mexegamosivimab.pdfIn PDF document text
    • https://panemomozig.weebly.com/uploads/1/3/4/5/134503052/vojabugipepimi_titikol_xuvapa_viripi.pdfIn PDF document text
    • https://bizavurodetilu.weebly.com/uploads/1/3/4/3/134391156/e364bdf0fbf3a5.pdfIn PDF document text
    • https://talupujepanuzan.weebly.com/uploads/1/3/4/5/134595677/2f1cdc99c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fomaralunex/gisobetimobulon.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/abramelin_libro_magia_sagrada.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/zexisarovuganugomejix.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/leduxiz.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/11162814608.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/bose_qc20_android_noir.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/80425310235.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/12027827206.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_off0000c8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B4 5276 bytes
SHA-256: 00b92a81e0fe04ea0b5edcc003a47d3abe54912cdd31cdd58fbb7397466dc180
font_01_sfnt_off0000da1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1C 11628 bytes
SHA-256: c2364a5559890bf85ab3c001de9cea358abf1f943c6caf3674d49624969ff239
font_02_sfnt_off0000fe98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE98 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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