Malicious PDF — malware analysis report

Static analysis result for SHA-256 6666cacd21bf588f…

MALICIOUS

PDF

79.4 KB Created: 2021-04-01 04:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 927e794580b8c85d27c9c63ed4dc2bac SHA-1: 8e7a6fcff90d00a30399ce9adecbc22b02e91fa9 SHA-256: 6666cacd21bf588fad832a40bbf01617c899f73322b03e0cae5a932183a52be0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many pointing to disposable domains, which is characteristic of a link farm used to distribute malicious content or phish for information. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure suggests an attempt to redirect the user to potentially harmful external sites.

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 http://paktum.pro/pressure_washer_hose_repair_connectorsyxcb.pdf In PDF document text
    • http://cmbespaceclient.xyz/95540685447w76np.pdfIn PDF document text
    • http://galufixagomedo.getenjoyment.net/likifezipidapesid.pdfIn PDF document text
    • http://filozajerezabi.getenjoyment.net/93438984821.pdfIn PDF document text
    • http://likefetevu.getenjoyment.net/bromwich_integral.pdfIn PDF document text
    • https://cdn.sqhk.co/vugujebeku/hi4hfVt/71603015957.pdfIn PDF document text
    • http://ferafukapawap.scienceontheweb.net/53713230733.pdfIn PDF document text
    • http://nibajafij.medianewsonline.com/zudelilu.pdfIn PDF document text
    • http://konovulibugu.iblogger.org/sql_injection_commands.pdfIn PDF document text
    • https://cdn.sqhk.co/wisisatofife/jbggf2J/9444758506.pdfIn PDF document text
    • http://pakawuwujawo.getenjoyment.net/allegory_of_the_cave_book_7.pdfIn PDF document text
    • http://nepesesi.22web.org/79520083166.pdfIn PDF document text
    • https://cdn.sqhk.co/sebuwemid/BhgkhaG/usda_forest_service_parks.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/hdgXSyJ/avoir_conjugation_practice_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/xubuzivo/jbtLEN6/tubopo.pdfIn PDF document text
    • http://pasetbs.xyz/netgear_dgn2200mv2_manualk10j1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/G1IkLG9TFNM/wb?keyword=pride%20and%20prejudice%202005%20watch%20onlinePDF link annotation
    • http://lezabiwobefek.rf.gd/tinet.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/pegujotetaruzenojaxedi.pdfIn PDF document text
    • http://famomijis.onlinewebshop.net/comma_splice_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/android_disable_auto_start_app.pdfIn PDF document text
    • http://gajopule.myartsonline.com/birepelewinil.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_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 5552 bytes
SHA-256: ed425046fc9af9bf20422a62cd14b3e87f00dcf021f034c0fa8a265943dcb143
font_01_sfnt_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 11212 bytes
SHA-256: 0b6df2c5c6bfe0284506ab17dcb1036507dafdd5c9d2d10db081e460c7b2f463

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