Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec61d4fe7308f4f…

MALICIOUS

PDF

76.5 KB Created: 2021-05-25 09:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f9ba3faedda84a8ab51b1f39e52a4101 SHA-1: 123ca58c5ec4d0b99ba14d6e01319d64eafc1ee0 SHA-256: bec61d4fe7308f4f35a7e2ff7b93ab6ec62f7384f1e2a77c51904afda1fd4419
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive 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 0.9997

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jottigo.ru/strik?utm_term=physiology+book+ak+jain+pdf PDF link annotation
    • https://jirafaribov.weebly.com/uploads/1/3/4/5/134599686/3500920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450883/normal_601f9f7f9b759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379489/normal_60623f34341e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420608/normal_60240e627784c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409998/normal_5fd121dd728ae.pdfIn PDF document text
    • https://pozivikebesar.weebly.com/uploads/1/3/4/7/134759309/2507318.pdfIn PDF document text
    • https://vasikeja.weebly.com/uploads/1/3/2/7/132710563/vozurakebuwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470016/normal_60098cf509fe4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376874/normal_5ff1fc90cfec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369328/normal_60663f3628d53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485828/normal_602fdcaa67b48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486215/normal_60089da2e1870.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/fizaxo/27074177429.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/49852709987.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/xapikesitonu.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/reduce_lowest_terms_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ea94e59-3867-46d6-9894-b67e1ec0c035/how_to_write_a_good_lead_for_news_story.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/al_quran_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ae0baf-eff1-494e-bae2-b7c1f696acb4/citizen_eco_drive_world_time_chronograph_easyjet.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/gutuzusodexegexomijigowi.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/vilutajali.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_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 5592 bytes
SHA-256: 57ed3916bc22243bd4c96a433145ab2cecaa3abb38ce6170280fe3cdd3ca2b98
font_01_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 10796 bytes
SHA-256: f641ac9466760bfac973b292967634683e401c84d2c2e01946118fc89851d8a0

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