Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4f9de23df2d56b…

MALICIOUS

PDF

74.8 KB Created: 2021-01-01 10:51:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1ad9565601a5239e0a3952492cc22089 SHA-1: 0edfe288ed6e7c2782275540f5c7668cc44597f3 SHA-256: 6f4f9de23df2d56bb4449f2cf0c9a69daa197a7fa9a31d4f660d033a35395e30
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-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://trafffi.ru/strik?utm_term=brhs+calendar+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451217/normal_5fbcf37e85071.pdfIn PDF document text
    • https://sajipetifejej.weebly.com/uploads/1/3/4/8/134883768/desumuwefajiluz.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/9726988.pdfIn PDF document text
    • https://godebisexizo.weebly.com/uploads/1/3/0/7/130775633/padokuxo_dexetimivuju_zoriduw_jizetajube.pdfIn PDF document text
    • https://ponutafozo.weebly.com/uploads/1/3/4/7/134705240/nabubimexu.pdfIn PDF document text
    • https://pizopivawot.weebly.com/uploads/1/3/5/3/135347149/tuluguxub.pdfIn PDF document text
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/sisuxosetugaja-mogimabivem.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/viwoxuz/team_stages_forming_storming_norming_performing.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/23245819083.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/24951684494.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/boy_scout_uniform_patches_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/case_study_report_sample_format.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/spiderman_cake_topper_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/47247617014.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_off0000e80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80A 5348 bytes
SHA-256: 1d1af285221fc737732075a4b74190099ec40cfc85e417e8349342202c77cb92
font_01_sfnt_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 10772 bytes
SHA-256: 7d30ca776f64b8e97d37f72d71670c0b2cd701e82300474a4839b0b2ef0a15a5

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