Malicious PDF — malware analysis report

Static analysis result for SHA-256 352849923b819ca1…

MALICIOUS

PDF

83.5 KB Created: 2021-05-23 09:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6709f0acc8b3ce6978c7f236384c00fd SHA-1: 598e18a38ce10bf1b7e8a4b75f106ec7b83ca91e SHA-256: 352849923b819ca1bc0ea040aa14d4eebad4338f5e8a901412a72d78d1d5a5e7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO-optimized PDF farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect users to potentially harmful content, masquerading as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/strik?utm_term=tuya+claudia+pi%25C3%25B1eiro+resumen+por+capitulos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427080/normal_605b9eb3a9f96.pdfIn PDF document text
    • https://mijebekebune.weebly.com/uploads/1/3/4/0/134017127/dapazixakamasiveku.pdfIn PDF document text
    • https://vewudati.weebly.com/uploads/1/3/0/8/130873955/597023fee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476126/normal_6034f468ef8dc.pdfIn PDF document text
    • https://domazatavaxagit.weebly.com/uploads/1/3/0/7/130775902/8f3e0a071a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412161/normal_603a85bb305e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464529/normal_5fdefdb89821e.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/gimisorixosu/mozart_the_magic_flute_queen_of_the_night_aria_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/mekajoraz.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/variedades_de_cafe_en_el_mundo.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/lenatizupedewizijijozif.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/iphone_vs_android_camera_comparison.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/rifisota.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/32885618209.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/what_are_the_duplicated_strands_of_dna_called.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/color_theory_books.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/powerwise_charger_not_charging.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/gikeguv.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/wibav.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/17462350030.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/80570520054.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/58997469485.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_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 5484 bytes
SHA-256: 08a655804161472a3294e011ea18cfed176863be6d5483a86a58d1bbd4ccdab6
font_01_sfnt_off00010101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10101 11944 bytes
SHA-256: 52f06044159d3265932a3f7ed20fce636de651b6750eb7986095d6d3295a2957
font_02_sfnt_off0001285f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285F 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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