Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c1ac487e4a0db8…

MALICIOUS

PDF

81.5 KB Created: 2021-06-12 06:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 045029cd399971278a24bcf7d08a81e9 SHA-1: e03982c179e877dde8ec782d617f210d700e7279 SHA-256: f8c1ac487e4a0db8675be9aedd67f29a0e3d6e4105ec2afcf4a5c81e31bf7215
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL, https://huntic.ru/pbw?utm_term=happy+birthday+song+status+for+brother, is likely part of a phishing or social engineering campaign. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it may leverage embedded JavaScript or other exploits to redirect the user to malicious content, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://huntic.ru/pbw?utm_term=happy+birthday+song+status+for+brother
    • https://cdn-cms.f-static.net/uploads/4377678/normal_5fdb1eccbea6f.pdf
    • https://govovoladadivaz.weebly.com/uploads/1/3/5/3/135304945/5037732.pdf
    • https://static.s123-cdn-static.com/uploads/4472188/normal_5fc756fa27592.pdf
    • https://cdn-cms.f-static.net/uploads/4368479/normal_5fd62892cde7b.pdf
    • https://regofixaf.weebly.com/uploads/1/3/5/3/135318676/mesokapolirano-moratoxirudo-damitewo.pdf
    • https://cdn-cms.f-static.net/uploads/4500444/normal_60bcd65b6008d.pdf
    • https://cdn-cms.f-static.net/uploads/4470553/normal_60ba39e939672.pdf
    • https://cdn-cms.f-static.net/uploads/4413474/normal_605573dfb4fb0.pdf
    • https://static.s123-cdn-static.com/uploads/4413718/normal_5fe2cb251c993.pdf
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/tuwez-nifukurum.pdf
    • https://kumaneke.weebly.com/uploads/1/3/4/6/134682587/rumezuzimakawax.pdf
    • https://cdn-cms.f-static.net/uploads/4478383/normal_600a4f2a5155a.pdf
    • https://cdn-cms.f-static.net/uploads/4489429/normal_60205204e38a6.pdf
    • https://funovupudejo.weebly.com/uploads/1/3/4/4/134473131/xatipizeti.pdf
    • https://gusobukenifoku.weebly.com/uploads/1/3/4/5/134525986/wirepakurivikefujap.pdf
    • https://jefaxuler.weebly.com/uploads/1/3/0/7/130775921/femak.pdf
    • https://julasunanuk.weebly.com/uploads/1/3/4/3/134308365/b6d275e.pdf
    • https://wetenonuvodipu.weebly.com/uploads/1/3/5/3/135321676/ravasuri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kedetuwi.pbworks.com/f/barry_windsor_smith_conan.pdf
    • http://tosuvop.pbworks.com/w/file/fetch/144751482/how_to_write_an_authorization_letter_to_claim_money.pdf
    • https://uploads.strikinglycdn.com/files/8143fc8f-a54c-4ae2-9651-16a0fd662944/is_john_wick_parabellum_on_netflix.pdf
    • https://uploads.strikinglycdn.com/files/a28dec2e-a878-401d-83cd-d107e4eb4a1d/budavipizalapokudaw.pdf
    • http://magobok.pbworks.com/w/file/fetch/144782964/83205154628.pdf
    • http://ronuzexem.pbworks.com/f/65746656758.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_off0000fe45.bin
c5e2a12daab3017c8fc1eb4a11ae0d4e9d2d24a7fbde55cf6859585f39e208cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 5476 bytes
font_01_sfnt_off000110de.bin
e68eb9cca34442b9da20761dee1beb81a50f6af73496de30955cea75fbcf8ca0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 11080 bytes

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