Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6998b10826a5d3a…

MALICIOUS

PDF

77.8 KB Created: 2021-03-07 11:06:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 23b7475201272ed6e3ce58ef854ebb91 SHA-1: c08104d0172932e584797f910b758df2317a01fc SHA-256: b6998b10826a5d3ab35d8faab9b33af6f33cdf1208201cb6f34becdbf004dcd6
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or scamming users with investment-related lures. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/123?utm_term=how+to+start+investing+for+beginners PDF link annotation
    • https://jugevenow.weebly.com/uploads/1/3/4/7/134736768/0e4751e0e.pdfIn PDF document text
    • https://gilaxisob.weebly.com/uploads/1/3/1/4/131406303/9486669.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/jimivixukaguwipamelemo.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/84851803099.pdfIn PDF document text
    • http://bebalezuve.medianewsonline.com/tebevakonak.pdfIn PDF document text
    • https://pijefezumiw.weebly.com/uploads/1/3/1/3/131379255/52e784050d1.pdfIn PDF document text
    • https://nabokopawupanav.weebly.com/uploads/1/3/0/7/130739772/zavev-gevuduveta-rixugibapuso.pdfIn PDF document text
    • https://jufozafofover.weebly.com/uploads/1/3/6/0/136050361/zejupanafirika.pdfIn PDF document text
    • http://tidivon.iblogger.org/vuxomidajozu.pdfIn PDF document text
    • http://vozuzutiwajuzip.getenjoyment.net/how_many_calories_are_in_an_everything_bagel_from_dunkin_donuts.pdfIn PDF document text
    • http://menetufebev.22web.org/38637857000.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuvelerejide.rf.gd/27111020478.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_b435ccefa165424cac7b8cd4751bced3.pdf?index=trueIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_fef2ebe5df3e48aba686367569db8cf8.pdf?index=trueIn PDF document text
    • http://zitorosenexof.epizy.com/waxupupelarovonedabotoj.pdfIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_753242ae263c462895fa57de69c2d9ff.pdf?index=trueIn PDF document text
    • http://kivekedifewu.rf.gd/ponakewiluda.pdfIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_e254d0e2a5bf4334a07d0f633b22c23f.pdf?index=trueIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_5efb1c8ec6194df799b4907c57b14816.pdf?index=trueIn PDF document text
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_90d8bfd665134627a17afce261fa2136.pdf?index=trueIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_23009af48eac4f0b9bf08d79f58c9522.pdf?index=trueIn PDF document text
    • http://kimoviranonaf.onlinewebshop.net/what_is_your_opinion_regarding_the_rh_law.pdfIn PDF document text
    • http://bototiluwoge.atwebpages.com/how_to_learn_sound_engineering_online.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_off0000f3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 5156 bytes
SHA-256: c2b622564bcdaab1c62015c8e0aa29bf1b2c63209c7751d034db4a23a6dceaa8
font_01_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 10488 bytes
SHA-256: bb63c42e0c8c9e4707f7127feabb39d11062f090d6a6ccc77bd66812300a20d9