Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a3b61e99a298e3…

MALICIOUS

PDF

79.3 KB Created: 2021-05-25 09:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f6a82115413e9850867a761d6417d9b SHA-1: 9b0b8dc563d67816827eab97003830bf3bb6dec5 SHA-256: a5a3b61e99a298e34abf68a7bab6256ad5bf54f13c91b4ce18452232f333ba2e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing campaigns. The heuristic PDF_SEO_LINK_FARM and the ML_NYX_PDF_MALICIOUS classification strongly indicate malicious intent. The embedded URL points to a suspicious domain, likely serving as a lure for users interested in "nitro type hack speed", potentially leading to credential theft or further malware.

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://xezojetit.ru/strik?utm_term=nitro+type+hack+speed
    • https://cdn-cms.f-static.net/uploads/4450519/normal_60328a7977a75.pdf
    • https://dulifemubal.weebly.com/uploads/1/3/1/3/131398350/vojorazefu_bavugopijone_nuxus.pdf
    • https://static.s123-cdn-static.com/uploads/4412902/normal_5ff3c14c5862d.pdf
    • https://cdn-cms.f-static.net/uploads/4419452/normal_600f7346a157d.pdf
    • https://cdn-cms.f-static.net/uploads/4409992/normal_6038b8e4ecc05.pdf
    • https://didipovewefof.weebly.com/uploads/1/3/4/3/134306756/c9121bb90fc621.pdf
    • https://cdn-cms.f-static.net/uploads/4448558/normal_5fe619e74baf3.pdf
    • https://static.s123-cdn-static.com/uploads/4449629/normal_5fef397f55e80.pdf
    • https://jazasamiwuri.weebly.com/uploads/1/3/4/8/134889091/xatiwemukibigaw-jerowebotovuda.pdf
    • https://cdn-cms.f-static.net/uploads/4445868/normal_603c23f2450e4.pdf
    • https://binapesod.weebly.com/uploads/1/3/1/4/131438069/xovakafuzof-koxanadota-funeturolafinot.pdf
    • https://nebobaxewakizix.weebly.com/uploads/1/3/1/6/131637309/nevodup_giniropuvilixuf_bufuxex_vamakaxa.pdf
    • https://xezojasupaxu.weebly.com/uploads/1/3/4/3/134352535/tukekixitum_sesapixamunolo_berujoze_gezubizaze.pdf
    • https://fewurigog.weebly.com/uploads/1/3/0/9/130969621/1210249.pdf
    • https://cdn-cms.f-static.net/uploads/4445889/normal_6033680fb4bfb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tifuwuw/gorazozav.pdf
    • https://uploads.strikinglycdn.com/files/4eac6bc1-826d-481f-b769-04a4fa8775e2/ashrae_fundamentals_handbook_2009_chapter_9_thermal_comfort.pdf
    • https://uploads.strikinglycdn.com/files/296f76ef-88ba-482c-a2f7-aa375542cf1a/how_do_i_connect_my_808_bluetooth_speaker_to_my_computer.pdf
    • https://uploads.strikinglycdn.com/files/b1af7831-0939-4ffc-8b18-4e412715e3f9/david_g_myers_psychology_12th_edition_in_modules.pdf
    • https://s3.amazonaws.com/xafaxotaful/busqueda_imagenes_google_android.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_off0000f995.bin
43153b2c91f6e9507636558f202eb9e022798b177f21a6c3c5161dd7f51b2e99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 5264 bytes
font_01_sfnt_off00010b80.bin
3db66037ec776e32610351113443f03e5eeac22f8369cea294c631f7861c1e72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 10752 bytes

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