Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fea20c57f2f582a…

MALICIOUS

PDF

140.7 KB Created: 2021-05-22 12:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e757af967972214c75952a4740c207a1 SHA-1: f6f7742286fd39bea2b9fd56e9f46e99c2d37e9d SHA-256: 1fea20c57f2f582ad852ca3f7bd8a02270751e081a091a132ba880427d1c3eac
156 Risk Score

Malware Insights

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

The PDF file contains a link farm and an external URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, appears to be a lure related to a study guide. The presence of embedded URLs and the ML classifier's high confidence score indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://lozipotod.ru/strik?utm_term=pharmacotherapy+principles+and+practice+study+guide+a+case-based+care+plan+approach PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467322/normal_604f5b6d2d583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450440/normal_60555eb421a62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376849/normal_60249a209f9db.pdfIn PDF document text
    • https://jurulekoteg.weebly.com/uploads/1/3/4/7/134700509/9e11489896f.pdfIn PDF document text
    • https://wuxudizujo.weebly.com/uploads/1/3/1/8/131859042/vokanonogif.pdfIn PDF document text
    • https://vaxevadokipab.weebly.com/uploads/1/3/4/6/134610393/wekuvozeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464739/normal_60032209b5057.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/devuxuzejozam/20050753460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89d4df57-e2b2-4a9f-8281-d7dbcbf67685/how_to_improve_strength_for_climbing.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/nuvolevo.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/competitive_exam_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f811528-c013-4098-8247-3003a5c81e8c/1142796063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b9e8509-deb1-424a-8d19-4926c3941f26/romebutajozuro.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/die_unendliche_geschichte_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5678b2d5-74c3-4b1b-a6d7-292e22ed0e95/38255093520.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/how_to_study_wing_chun.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/55771214612.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/don_chandu_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/sotupo.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/67903759242.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/24094209125.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E802 5760 bytes
SHA-256: 903780f20e18f24f4a68142dcb088ae1caa0b8d2fc1225d8d48541b3d116babb
font_01_sfnt_off0001fb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB79 11716 bytes
SHA-256: 2db7ffbab8cbb45ddc520a1609643bb7f6555a527e377645ce61fd224d6dcab4

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