Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bcf70c3d19d321c…

MALICIOUS

PDF

80.7 KB Created: 2021-05-21 07:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1298ecfa97c7e27b316cb04f8285936a SHA-1: 7a2e2ed7ef3c1cd32d6eb880d027cb2fdddf60c0 SHA-256: 1bcf70c3d19d321cc0735a1c2676ebb4c868cad17d5f5a78762bd423fdcbd68f
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating a link farm and an embedded URL, pointing to a suspicious domain 'ponafet.ru'. The document body, though heavily obfuscated, appears to be a lure related to downloading music. The presence of numerous external links and the ML classifier's high confidence score suggest this PDF is designed for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=how+to+download+music+from+musicbed+for+free
    • https://cdn-cms.f-static.net/uploads/4483591/normal_5fd82cbb146f4.pdf
    • https://cdn-cms.f-static.net/uploads/4495257/normal_60371e1a65ef6.pdf
    • https://bitusuverutito.weebly.com/uploads/1/3/1/8/131871453/5061996.pdf
    • https://cdn-cms.f-static.net/uploads/4374976/normal_6037741268dbc.pdf
    • https://feroxetisilujux.weebly.com/uploads/1/3/1/4/131409167/fetajaridok.pdf
    • https://cdn-cms.f-static.net/uploads/4504568/normal_601509b26211b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/853b4d9d-7100-4c89-be73-ea684566bad2/falojodorezafenuwitupufad.pdf
    • https://uploads.strikinglycdn.com/files/9ebb09dc-622c-4224-8e84-e52c97c61c1f/44777690157.pdf
    • https://uploads.strikinglycdn.com/files/69621fc3-2312-4dc4-843a-d00b57659d0d/adobe_premiere_pro_cc_2018_full_tutorial.pdf
    • https://uploads.strikinglycdn.com/files/68bf904f-dd46-4b36-b4de-951aae442192/49355486698.pdf
    • https://uploads.strikinglycdn.com/files/a194ba37-1a60-4016-9dcb-062d0284c60d/xusetofupewapipaze.pdf
    • https://uploads.strikinglycdn.com/files/37ec5333-3a30-4858-949a-209953bc8905/71587081127.pdf
    • https://uploads.strikinglycdn.com/files/c8213a82-4fef-49ed-88b2-6448b4943b71/82566789022.pdf
    • https://uploads.strikinglycdn.com/files/6c6ea4d1-390f-4094-9f3a-dd00007ee8ff/life_skills_lesson_plans_for_adults_with_disabilities.pdf
    • https://uploads.strikinglycdn.com/files/a1572105-8f86-444a-ae36-829f3dca84a1/betania.es_moniciones_ciclo_c.pdf
    • https://s3.amazonaws.com/mizeteb/nizirerirelujowitemevu.pdf
    • https://uploads.strikinglycdn.com/files/a6a96707-918f-44f1-8a02-746277fee143/dungeons_and_dragons_books_amazon.pdf
    • https://s3.amazonaws.com/wopari/25724863313.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc37.bin
d0f210eb58da6690ffe9d04986da46c63d4aed840e92e3d0f0cba53984d6864d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 5360 bytes
font_01_sfnt_off00010e6d.bin
2237e79c4a58befd060d4d2678ae6d78e9bd32c77452707af3035668e9283593		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 10868 bytes

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