Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a5690e529b676c…

MALICIOUS

PDF

96.8 KB Created: 2021-03-11 01:20:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 36230f23ec646a893ead1c5eef874dd8 SHA-1: 01a23d6438d7a54617e4a71192f1443fa8a6c728 SHA-256: 23a5690e529b676c994daf716bfc260e7bf7be80e98001f27881eb248a219603
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, including one pointing to 'kuzutuzo.ru', suggesting a link farm or phishing attempt disguised as a free download. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs indicate it likely attempts to redirect the user to malicious content or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=data+communication+and+networking+ppt+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417986/normal_5fd08a5b5340f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415782/normal_5fe900ed4dc6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409246/normal_6004d3e674596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377100/normal_601da0bfc66df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454561/normal_603c39abeaaf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409992/normal_602ae7e61f3b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452206/normal_60344b433c357.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/bifesulege.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/free_piano_sheet_music_for_beginner_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/dobuwibevupow.pdfIn PDF document text
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_2bc49b8b58874bdea11cc263d643b87f.pdf?index=trueIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_c9f6b5e5d37d4cd6b3aede0b2afe72da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomuper/hwy_63_alberta_road_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac58df8-7d64-45a9-ac26-b8fd6f37a4c6/kumemujoporukolut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c844d33-7108-4665-8279-3b75df9d19f8/zesalapunotovimu.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/44895681316.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/quipper_untuk_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/auto_binary_bot_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13094 5336 bytes
SHA-256: 95f7a9379490142ad2ee4909d49d569f3247608f942f258f49d2fb57b868c8a1
font_01_sfnt_off000142bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142BC 10784 bytes
SHA-256: 83aaeef33f9b35034e258cc966f99cce32b634c0ab9786cd6def2326655cf2be
font_02_sfnt_off0001676f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1676F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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