Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0bc12aba0ebf3b…

MALICIOUS

PDF

71.8 KB Created: 2021-02-22 13:17:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 516d5899d0891c0400ceea9d21ffc018 SHA-1: e9a11be71a68d858fc5e5b7db915e8d3264e2eb9 SHA-256: 8b0bc12aba0ebf3b8d3aeafff01a8132e931e714d73f569ddce3dd18caa5efd6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to PDF files, indicating a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

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://seumenha.ru/wix?keyword=vizio+e320i-a0+firmware+update
    • https://jugefisofewutep.weebly.com/uploads/1/3/4/3/134368120/998d1208e3.pdf
    • https://narodejezagog.weebly.com/uploads/1/3/3/9/133988416/luwativujex.pdf
    • https://wusezituvita.weebly.com/uploads/1/3/4/6/134608160/665bea05621a6.pdf
    • http://guvinesusavilo.iblogger.org/balak_palak_full_movie_filmywap.pdf
    • https://donikigegetala.weebly.com/uploads/1/3/4/3/134311768/9051632.pdf
    • https://zexirajeroluwub.weebly.com/uploads/1/3/4/8/134848753/373105.pdf
    • https://vazanekufom.weebly.com/uploads/1/3/5/3/135322674/lusurimabetir_vodenujojuw.pdf
    • https://rewazute.weebly.com/uploads/1/3/4/6/134648352/e9d4564db6301ce.pdf
    • https://woxazalaxit.weebly.com/uploads/1/3/4/2/134235403/906009.pdf
    • https://wamukefak.weebly.com/uploads/1/3/5/3/135324497/sozubapeni.pdf
    • https://ranenowubugipo.weebly.com/uploads/1/3/4/0/134040983/ditex_vulusituxoze_riwuvufufo_tinajedoderik.pdf
    • http://jazeforip.22web.org/itunes_for_windows_8._1_64.pdf
    • https://vogoniboka.weebly.com/uploads/1/3/1/0/131070279/f8791965.pdf
    • https://xolesozetenosox.weebly.com/uploads/1/3/1/0/131070434/vetusub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bevonox.epizy.com/boviri.pdf
    • http://pamagidobiguvi.rf.gd/speed_time_graphs_worksheet.pdf
    • http://zosutifajo.rf.gd/jobab.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_off0000dba5.bin
9cf416086324c507d20c4d98d2004f067a34ca380841165a36e513b2eb3a71cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA5 5556 bytes
font_01_sfnt_off0000eea0.bin
4893f57a013fc613222a05a141e5a4d257430daca6889e2003f86e20ec5cdd1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 10244 bytes