Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ac978f3303dc25…

MALICIOUS

PDF

69.6 KB Created: 2021-02-21 16:47:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1b4edaa199e19130cf5aa3aee8b989f7 SHA-1: a60fdf0a82059eafa12a6037c7ea561d64542934 SHA-256: 96ac978f3303dc25cf35477833d553de5060f21666e60253a649a562d9a7238a
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to various external PDF files hosted on disposable domains, likely as a lure for phishing or malware distribution. The presence of multiple external links and the ML classifier's high confidence score indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to facilitate the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://baarspo.ru/123?utm_term=adobe+acrobat+pro+free+download+for+windows+7+32+bit PDF link annotation
    • https://rebopugosoge.weebly.com/uploads/1/3/5/3/135346619/5698985.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/sexokoxegaro_sowiji.pdfIn PDF document text
    • https://doxorovovo.weebly.com/uploads/1/3/4/4/134479089/2115969.pdfIn PDF document text
    • https://lupawepenotude.weebly.com/uploads/1/3/1/6/131606523/nidukurekoxejex_zuretojop.pdfIn PDF document text
    • https://napuraviseso.weebly.com/uploads/1/3/4/3/134322211/radon-rosegux.pdfIn PDF document text
    • http://freshmind.net/download_game_furious_8_drag_racing_mod_apk9li5h.pdfIn PDF document text
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/rozejijuvagetawuvo.pdfIn PDF document text
    • https://wirorovikematu.weebly.com/uploads/1/3/1/0/131071137/9346064.pdfIn PDF document text
    • https://jitotapo.weebly.com/uploads/1/3/5/3/135314003/3920512.pdfIn PDF document text
    • http://albl.ru/alfabeto_japones_hiraganazptnf.pdfIn PDF document text
    • https://gufonalika.weebly.com/uploads/1/3/4/0/134096228/59405.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/70802886483.pdfIn PDF document text
    • http://jiwepatifon.rf.gd/3391713708.pdfIn PDF document text
    • http://lodibusalibazi.epizy.com/74840916492.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/vsphere_6._5_enhanced_authentication_plugin.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/17128479817.pdfIn PDF document text
    • http://nisebot.epizy.com/pifutulisokasejuru.pdfIn PDF document text
    • http://wefubosapinu.rf.gd/sositeb.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD364 5744 bytes
SHA-256: 03ada88ceaa2bb0b3f174b31cc7631a239dd2bffdcb9f396539e179b0ee18e07
font_01_sfnt_off0000e71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71B 9904 bytes
SHA-256: 2ca6579864d352667c8174315e971002ba57d74c7cf2d19d09c6be5019cdb369

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