Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b136228c9e05245…

MALICIOUS

PDF

99.1 KB Created: 2021-04-30 13:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 095976ffa83d25961369021c20f00272 SHA-1: 717150fc37ebfa1e5fcb3662c6d214478923f1d9 SHA-256: 1b136228c9e0524582dd7e0f0bb077f37922be8d0f3f45dc4e8798f6122e3db8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9988

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://seumenha.ru/strik?utm_term=d%2526d+tilesets+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456121/normal_605b5c324d7e8.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/qcieZjO/silverback_gorilla_fighting_gif.pdfIn PDF document text
    • http://trickyturkey.com/13432683197fhy5n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_60446ec4167e1.pdfIn PDF document text
    • http://bluebadge-support.com/270432498264ubom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466172/normal_5fd270d20b094.pdfIn PDF document text
    • http://pejedoreraberet.22web.org/tunotafizilepime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451574/normal_6020551f25263.pdfIn PDF document text
    • https://cdn.sqhk.co/muzubasiwu/mLyDQhi/sniper_anti_terrorist_shoot_mod_apk.pdfIn PDF document text
    • http://invitesistem.ru/juwalinnbol0.pdfIn PDF document text
    • http://nowefefufuduw.iblogger.org/bmw_320d_m_sport_manual_or_auto.pdfIn PDF document text
    • http://gezilobogobig.22web.org/best_android_phones_under_15000_smartprix.pdfIn PDF document text
    • http://apparentlyopt.com/audible_audiobooks_podcasts_audio_storieshysus.pdfIn PDF document text
    • https://cdn.sqhk.co/mifopanikil/BGhgiaf/57316786181.pdfIn PDF document text
    • http://bitsracing.net/mecanica_vectorial_para_ingenieros_dinamica_hibbeler_12_edicionrvw4a.pdfIn PDF document text
    • http://betmoy54.com/1437736441o1gpk.pdfIn PDF document text
    • http://national-verifyteam.com/fridge_and_freezer_temperature_log_sheet_australiam5bg1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bifosegejigeg.rf.gd/gobibigurorojow.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/capitalization_and_punctuation_online_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/kutilikob.pdfIn PDF document text
    • http://wegudewabeko.rf.gd/ledanutozinakujukag.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/genie_screw_drive_garage_door_opener_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/46652469396.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8D 4156 bytes
SHA-256: d9d9eb8b5a67a8494ca5a9593d54773c41ba913a17cb426b52e0a193c0b11448
font_01_sfnt_off00013cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBB 14364 bytes
SHA-256: 44579dee064d5d1a17538fde4eeb0b3bda74f72e40e5e77ebfe3fd3ac2985285
font_02_sfnt_off00016a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A7E 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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