Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4d2eb1d9c65582…

MALICIOUS

PDF

79.7 KB Created: 2021-03-12 10:39:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ceb2ff49a377058355c64282fcdbfebd SHA-1: 5f62319167a3ba2b82c98a51f6593c61fcdb1ccc SHA-256: aa4d2eb1d9c655826637d88baa1dc3bb311cdfcf790cc28c4035c9d918456a01
136 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses a LOLBin command-execution lure. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://golowaki.ru/award?keyword=architectural+photography+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495974/normal_5fe419398b142.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488809/normal_5fce5ecce7580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475874/normal_603200297d5b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453537/normal_601b7b675fe21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458849/normal_5fde82a76dc91.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/MRcQjcw/knife_spinning_skills.pdfIn PDF document text
    • https://cdn.sqhk.co/kumotuxijufu/f0lbgeS/voxusederojepuxilaxumusux.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/N6jhBgg/pinball_game_on_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/jhdhcYC/bcbs_alabama_drug_prior_authorization_form.pdfIn PDF document text
    • https://cdn.sqhk.co/sazipuvaxiv/hcFHohh/kavagosepikorifuxevu.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/idCMD0D/granny_mod_menu_outwitt_download_1._7._3.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/mubefula/sewewubunawokuvexazizif.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/29407114492.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/comparisons_of_equality_spanish_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/my_talking_tom_game_for_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/vtech_manager_kidizoom.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/maputib.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/aisha_babez_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/zugozijeneb.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/abhimanyudu_background_music_free.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_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 5332 bytes
SHA-256: 41fb656f75ea7bce460fc679824cb4dae720fb5bf93b82d64b9c7167a67c334a
font_01_sfnt_off000101fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FB 14596 bytes
SHA-256: 084dd8ed9500c30b4d6e23cb668a82e7ca18923f69d1012de20450911837db51

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