Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6742659c4dc831…

MALICIOUS

PDF

75.8 KB Created: 2021-04-03 07:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 58bf7cc0f817e36b588e344cfe3c7ff5 SHA-1: ecf59c0d2f901e649ff3346ebce758c26cbcc987 SHA-256: 6b6742659c4dc831b34d4977a7e253d48934dab4da719fe3a41f752168785cc4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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 https://zajinet.ru/strik?utm_term=fitbit+versa+lite+screen+wake+not+working PDF link annotation
    • https://zumuwezejulo.weebly.com/uploads/1/3/1/4/131455722/6f6e7d71bfdf24.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/Ngcijis/fleet_combat_training_center_atlantic.pdfIn PDF document text
    • https://kokujilu.weebly.com/uploads/1/3/1/4/131453241/bepuzuvo.pdfIn PDF document text
    • https://guxadudupis.weebly.com/uploads/1/3/4/7/134751999/wurirafurufixuja.pdfIn PDF document text
    • https://cdn.sqhk.co/wadebekop/cigjaig/89878603424.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/4681987737a6itc.pdfIn PDF document text
    • http://fit-italy.space/918933321663k65v.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvakumo/4UsraN1/46041686666.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/Xgc4Qhd/super_mario_world_map_guide.pdfIn PDF document text
    • http://santecmb-sarl.com/isaac_asimov_collection_of_short_stories_nyt_crossword6rcuo.pdfIn PDF document text
    • http://lupazul.mywebcommunity.org/10_steps_of_service_for_servers.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/g5hdNAN/xokig.pdfIn PDF document text
    • http://hocostyle.ru/wilajijireti986lo.pdfIn PDF document text
    • http://cartest.pro/fagonamiwitikujivilozaur9w.pdfIn PDF document text
    • http://repizedozoful.sportsontheweb.net/wupixapofifunojadozeteje.pdfIn PDF document text
    • https://wukarogokemek.weebly.com/uploads/1/3/0/7/130739107/72750.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/jaxesabi/does_asus_rt-ac68u_have_a_modem.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/where_can_the_book_of_jasher_be_found.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/50940915551.pdfIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/71116338118.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/how_to_fix_braun_thermometer_pos_error.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/pelagijovogodol.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_off0000e910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 5280 bytes
SHA-256: 8721c0992ca00e1246b61aa05c6a85f2731eb3a88df01e463823b10a04597450
font_01_sfnt_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 10836 bytes
SHA-256: ec8ead5e540c902f61153bdf70942a567bb8ecfda348ab364c356c112e4eb40c

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