Malicious PDF — malware analysis report

Static analysis result for SHA-256 491541b5ab8f70ff…

MALICIOUS

PDF

76.2 KB Created: 2021-06-06 18:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 19a5d102ee9c45982d1727f23af0c73a SHA-1: 5cb828f3066073e7bcd10872d6db5c9e2b858517 SHA-256: 491541b5ab8f70ff87f2ec8a4235a450a0ee16a93d7eda2c3fc585ae7a260add
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to a suspicious domain, likely intended to host malicious content or redirect the user. The document body, though heavily obfuscated, suggests a lure related to 'letter of complaint answer phrases', aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/123?utm_term=letter+of+complaint+answer+phrases PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420761/normal_6061cbff47836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457302/normal_5fe9fdaa3b297.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501991/normal_6005747e86938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_5fd12a14e6e8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481280/normal_5ffdb2c2111ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_602ae54c144cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492897/normal_6001c73d120b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487431/normal_603b51a1f4165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383147/normal_60586224cbc39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464852/normal_6007ba75435b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405437/normal_606e321de47a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/062c3aff-b7a4-4c77-ac94-a8add5142e5c/41168813185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdd57a62-6e0f-4028-b4aa-a50c6f45d3a1/a_woman_in_berlin_film_online.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/w/file/fetch/144656991/usmle_first_aid_2020.pdfIn PDF document text
    • http://pinurakus.pbworks.com/f/harry_potter_5_pelicula_completa_en_espaol_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/054ba422-a5b1-4b9d-9df8-8c8eb17992ca/lovekated.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a28066cf-5ff5-4418-81ab-c8f02a302b5f/ludinitimowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99ee02c4-1a80-4c8a-8fd7-58aed8ef3701/mainstays_turbo_convection_oven_manual.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/w/file/fetch/144520866/wild_animals_coloring_pages_printable.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_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 5288 bytes
SHA-256: 112c27766eeda97da2027aca829547fc67f993c97a8f4dc80c746873fdbaad25
font_01_sfnt_off0000fd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 11528 bytes
SHA-256: ded2aa207b9424df839c9e95f8a70dbac2e19190a605519b16a11bd39d4fc12d

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