Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0524ae07ad622ac…

MALICIOUS

PDF

69.3 KB Created: 2021-03-03 23:19:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fee0daebb664e71c0bc2f42cfa38ce5d SHA-1: e846186e44b8f37088167f8285fd2d3c706db9bb SHA-256: c0524ae07ad622acc821419e6a35060da812e483549f92d6ebc59dac7676f583
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs, suggesting it functions as a link farm designed to redirect users to potentially malicious websites. The presence of external URIs and link farm characteristics points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/aws?utm_term=rca+5+cd+changer+stereo+troubleshooting
    • https://pilopagitek.weebly.com/uploads/1/3/4/8/134856928/5746510e747.pdf
    • https://cdn-cms.f-static.net/uploads/4417033/normal_5fd85925ef113.pdf
    • https://static.s123-cdn-static.com/uploads/4409827/normal_5fcdd17aefbef.pdf
    • https://fepafevadaxajaw.weebly.com/uploads/1/3/4/0/134095897/1082879.pdf
    • https://static.s123-cdn-static.com/uploads/4385207/normal_60025d6732b84.pdf
    • https://cdn.sqhk.co/ranotigu/1RibMLf/zavetifosezuzig.pdf
    • http://fovikoxesaweziz.medianewsonline.com/56639123860.pdf
    • http://jiwapadenejeza.getenjoyment.net/how_does_google_maps_traffic_data_work.pdf
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/9614910.pdf
    • http://zibepifutidi.sportsontheweb.net/fifasir.pdf
    • https://cdn-cms.f-static.net/uploads/4484154/normal_6016b319e9896.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://duxegejuw.atwebpages.com/lyrics_to_gonna_rise_up_singing_its_a_brand_new_day.pdf
    • http://ribibivuja.rf.gd/latest_covid_19_news_us_death_toll.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_off0000d378.bin
514ad6c66b55b735b661b431440f49c08574071ccbb5350123ac218f73a86c99
pdf-font-stream PDF embedded font (sfnt) at offset 0xD378 5472 bytes
font_01_sfnt_off0000e611.bin
efc80ff10fbcd2d286443e32d9ffc5aa6e7542175a2e25a2b0d04dc56976ae9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 10036 bytes