Malicious PDF — malware analysis report

Static analysis result for SHA-256 303de6269ac52579…

MALICIOUS

PDF

82.1 KB Created: 2021-03-03 22:30:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b4301a8510054b8d942e8a95ed467197 SHA-1: bfbb79d338cbf7d0a9888b74b81b08b0b5bbaa86 SHA-256: 303de6269ac525790a87d3269ccd9ccbd6127fd4cc97c3a5fe1a0061772679e6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The presence of a large number of external links, including one pointing to 'midufefew.ru/strik', strongly suggests a phishing or SEO spam campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent to redirect users to potentially harmful content.

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://midufefew.ru/strik?utm_term=monstrous+meaning+in+bengali PDF link annotation
    • https://zemedabumudog.weebly.com/uploads/1/3/2/7/132712209/zotonabiromeke.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/jyf3Pgh/ojoo_short_videos_for_entertainment.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388276/normal_5fd6c6009b673.pdfIn PDF document text
    • https://jeboxalu.weebly.com/uploads/1/3/0/9/130969965/samajifejogav.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/2780c4499c74ae8.pdfIn PDF document text
    • https://cdn.sqhk.co/zitedefew/jiMhijh/11250174237.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497666/normal_5ff0362c8c4af.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/jq8ghlP/62003561584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409425/normal_602d6e455ebff.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/egjhBjj/teppanyaki_grill_laurel_coupon.pdfIn PDF document text
    • https://cdn.sqhk.co/kafexobesa/h3PIvha/26659376868.pdfIn PDF document text
    • https://cdn.sqhk.co/linerutinew/Cy5jfjD/dungeon_crawl_stone_soup_sound_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/giboxikewev/jahi8gi/gugupunimoravonosalibuj.pdfIn PDF document text
    • https://cdn.sqhk.co/jukunobegabe/ezztgef/jagukoberixegapapavoxo.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/dv0hid8/jevazatojenidirilopadu.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/ribowexulo/72878659625.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE117 5148 bytes
SHA-256: dd15e8debfdf5e8fb8b6ef8165e25cf2bd0e95325f8370aad4bb0b11e0a1e9f0
font_01_sfnt_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 8680 bytes
SHA-256: e040e57ca9f6ffeb6c4e837bdafc6ddd9147510e6d0dd03f6e120af0ed212c42
font_02_sfnt_off00010e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 14216 bytes
SHA-256: 7642eded3136036b5d6c2d9e494e07cb9c1bb983e08bc19de120631a5305bf6f

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