Malicious PDF — malware analysis report

Static analysis result for SHA-256 1afb4304bf3744e0…

MALICIOUS

PDF

78.8 KB Created: 2021-05-19 19:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4964e7165a25440b2dc5e4a235a6da4c SHA-1: 725990d04fd180f8a6a1b01cc7eb01785f6ed39a SHA-256: 1afb4304bf3744e00483c2266b1d18717cf71cd928132e7c9e7bd822c94eb4bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that contains numerous external links, a common tactic for SEO link farms or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

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://xajibur.ru/strik?utm_term=free+drinks+menu+templates+for+word PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415946/normal_600bf8bdcb3c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451567/normal_603ff0340a261.pdfIn PDF document text
    • https://jepalojut.weebly.com/uploads/1/3/4/8/134863082/tebunogajeru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458614/normal_600590dd22896.pdfIn PDF document text
    • https://kixuvatapowow.weebly.com/uploads/1/3/1/3/131383305/35203596bec6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466391/normal_5fc5d11d75ca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417327/normal_601b2866c6575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476002/normal_605c8ba9a0999.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/tirimofufemukat/jexarivezumutun.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/proving_trigonometric_identities_examples_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/apple_music_vs_spotify_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/harbor_freight_air_compressor_parts_list.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/halio_la_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/mijer.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/charo_chicken_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/hoyle_casino_games_free_full_version.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 5300 bytes
SHA-256: b6462a20e72a3479264412598246cff45600b0d7bda20af9cf45e03f6c73ea37
font_01_sfnt_off0000f47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 10848 bytes
SHA-256: 97b178e31058838116158faad1df4fa8d7d4d7d5670d0942d6f5d3629897c750
font_02_sfnt_off00011926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11926 16068 bytes
SHA-256: 5d72d630640305d452d914085fd6c65e0d8125198bed8028c282d44fd0327be8

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