Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac6c1e6fbc157e5…

MALICIOUS

PDF

87.9 KB Created: 2021-03-04 08:12:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2ba42fadad86b09edf59d565d15b18a0 SHA-1: 11020ebf7f169954f91e59e68d3aba96468445b9 SHA-256: 7ac6c1e6fbc157e5da085f1ecf8e50949c2550e1381e1d2544b075f0a26beac9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/123?utm_term=briggs+and+stratton+15.5+hp+engine+oil PDF link annotation
    • https://cdn.sqhk.co/viwedanej/dXzLHop/red_and_blue_states_2020.pdfIn PDF document text
    • http://gamowenugeg.sportsontheweb.net/formato_de_hoja_de_vida_en_word_para_editar.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/bukeke.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/mKKhcLp/heartgold_walkthrough_walls.pdfIn PDF document text
    • https://felekiki.weebly.com/uploads/1/3/4/6/134689652/d306b0a.pdfIn PDF document text
    • https://gixefizavemo.weebly.com/uploads/1/3/4/1/134108956/momaxupifinemapot.pdfIn PDF document text
    • https://cdn.sqhk.co/risejesob/snggjgD/1st_grade_math_worksheets_teks.pdfIn PDF document text
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/1324b37f59263.pdfIn PDF document text
    • https://vimexizud.weebly.com/uploads/1/3/4/7/134755563/vumufipatulubev.pdfIn PDF document text
    • https://xoxomedeze.weebly.com/uploads/1/3/5/3/135308121/gomutuxabovamugav.pdfIn PDF document text
    • http://tamekawarol.66ghz.com/zobagowibejimosuxepubes.pdfIn PDF document text
    • https://wuvalarovujed.weebly.com/uploads/1/3/4/2/134266489/vegiwezexe.pdfIn PDF document text
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/jireduwezi_dipalan_sanakepoforumit_denoruwuv.pdfIn PDF document text
    • https://cdn.sqhk.co/vinogusi/zKgehiG/best_food_delivery_deals_right_now.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/4148058.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bagugexasorip.myartsonline.com/wanovowiwetudidijebola.pdfIn PDF document text
    • http://zilowovuv.atwebpages.com/paulo_freire_philosophy_of_education.pdfIn PDF document text
    • http://sedijinuv.epizy.com/bootcamp_xp_drivers.pdfIn PDF document text
    • http://fujexadegog.rf.gd/83070620272.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D16 5264 bytes
SHA-256: 602fd369b180437ede9221cafbede600b74f7c6b3354add97eccc2af66a61511
font_01_sfnt_off00011efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFA 10736 bytes
SHA-256: 0c9d1c481810de617bd90a5b340c1cca5264a1fa7e639c66ccc7b6dd25438e2a
font_02_sfnt_off000143d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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