Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0fe0df10cb26b8…

MALICIOUS

PDF

115.9 KB Created: 2021-03-21 06:41:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: eaf7eb80efa3813d668b9dd4d480ccb2 SHA-1: 59320c6a6e864c843d57d40d875b804e3f3a27f1 SHA-256: ca0fe0df10cb26b871771360996ccd6d7ae36b12f8f6686195a0e005baf4f11d
156 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule indicating a large number of external links, and a ClamAV detection for Pdf.Phishing.Trojan. The presence of embedded URLs, such as 'https://kuzutuzo.ru/award?keyword=article+50+brexit+pdf', strongly suggests a phishing or malicious redirection attempt. The ML classifier output of 0.9996 further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/award?keyword=article+50+brexit+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450419/normal_602928eecb174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469351/normal_602cf304ddb28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385213/normal_5fe018ead7c02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425727/normal_5fffef05ea471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427284/normal_604ddc45cb031.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375195/normal_60493eb9c667b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405467/normal_5ffc9c3d4ad2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_60490350e7559.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/wixamupelinere/8378414710.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/1436461319.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/powamujosexavawedeso.pdfIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_b4d833990fd244f3ab9a469ed8c85e79.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paxunu/car_parking_game.pdfIn PDF document text
    • https://42f4b946-f871-4f2a-a73e-6571c6569919.filesusr.com/ugd/e20521_362873b4ea6d4049bf1b1dfe91ae87e2.pdf?index=trueIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_f33313f5f29746ec9c88df1be6ed9aa9.pdf?index=trueIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_30d11d83ea7c4a68ae69bb29fe2949f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legesiliv/la_gazzetta_dello_sport_calcio_inter.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/nuxevedokewimewavadabuti.pdfIn PDF document text
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_67f690da1a0e40fa9ab717161194352d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tinezedu/kimadadato.pdfIn PDF document text
    • https://034b020c-baab-45d1-b3ff-c950d21f9178.filesusr.com/ugd/3c93bc_14fb943f443e4a8a932b59740608742c.pdf?index=trueIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_e393f6816b0d4a699db300b6d55337c6.pdf?index=trueIn 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_off00018710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18710 5224 bytes
SHA-256: 1d193309b4b8ca7bc8bbc52248e30e7e42113ab90e8adae19514cc332e5a34f9
font_01_sfnt_off000198f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198F0 12280 bytes
SHA-256: 7881b31fde6119c93364fced5f6d15e54c3456c13a414c1faf29f0abc439c3b3

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