Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7be519b7092256…

MALICIOUS

PDF

86.5 KB Created: 2021-04-06 13:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 781d28aaf0a69bc876acca1945de63c6 SHA-1: 54aa68f3ab21ce433786463e02d5e29c80ed6899 SHA-256: 2a7be519b7092256011b9360ed954d0ca0d57752c916fadd7dc4359e8bf8dd27
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=how+to+change+my+safety+1st+thermometer+to+fahrenheit PDF link annotation
    • http://ninijefaligogi.mygamesonline.org/green_day_boulevard_of_broken_dreams_tab.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/bjeghR4/24638908675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488806/normal_6052b1343f8d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454808/normal_603f99c563bff.pdfIn PDF document text
    • http://pokinusuvato.getenjoyment.net/kuvadunumoputix.pdfIn PDF document text
    • https://cdn.sqhk.co/fosuzonarefi/7ibJOhc/present_simple_negative_exercises_for_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478378/normal_601a18f899cbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454286/normal_6066438db5a16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463812/normal_6011513d293ee.pdfIn PDF document text
    • http://dirozigumifew.scienceontheweb.net/correspondance_albert_camus_maria_casares_espaol.pdfIn PDF document text
    • https://cdn.sqhk.co/rerupovev/jfgdiaD/cost_accounting_definition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480880/normal_6002166d7711b.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/jenQjak/cobalt_international_energy_inc_annual_report.pdfIn PDF document text
    • https://cdn.sqhk.co/bisadidizi/8hbjcMD/48491994986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443292/normal_60336545615c0.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/3wienrg/vmware_horizon_client_multiple_monitors_mac.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/mivijigonof/yHZhaFd/74158442495.pdfIn PDF document text
    • https://cdn.sqhk.co/velizovatim/hWPkgiU/war_dragons_breeding_guide_2020_red_s.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/jjdifha/vanudi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/444In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000102a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A0 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off00010ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE3 5468 bytes
SHA-256: ea9275aec95961fce1adba5b43a2638da3e63ad18bf935e00764ec579df948e4
font_02_sfnt_off00011f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7C 13568 bytes
SHA-256: 88835ac249979b4445854a5d3bff8aa1c49fd4ac94587cafc638aa884597adf9

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