Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad43a027ce6e584e…

MALICIOUS

PDF

72.9 KB Created: 2021-03-11 18:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f19ec2b2dda0a8ae803c6d3ac69919e2 SHA-1: c3b7e714fa52a3036d22c285f62aae7e20573d00 SHA-256: ad43a027ce6e584e55f7b7cd03aafb5401e9cef54d6c2bb18f47d7a3492c7247
156 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. 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 0.9995

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/123?utm_term=bullet+bandi+dj+naa+song PDF link annotation
    • https://cdn.sqhk.co/sepovili/bgfhg3J/tipatomi.pdfIn PDF document text
    • https://cdn.sqhk.co/mejofiwog/8dgjmAI/zowomib.pdfIn PDF document text
    • https://cdn.sqhk.co/mabisurud/bAhj31a/cheat_gacha_world_download_apk.pdfIn PDF document text
    • http://qrastenmap.online/610_long_tractor_parts_manual6kegy.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/vCje3bx/sawovisimeraxabavibabivu.pdfIn PDF document text
    • https://cdn.sqhk.co/sejarepezibo/WThbjko/asteroid_approaching_earth_now.pdfIn PDF document text
    • http://italywow.space/yard_machine_snowblower_5.5_hp_22_inchw8t1a.pdfIn PDF document text
    • http://mavpa.fun/sqlcode-904_sqlstate57011_sqlerrmcefyll.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/lanigotupozapajes.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/how_to_do_physics_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/fsbpt_individual_score_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/cerrar_cuenta_de_facebook_desde_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/407204cd-5f69-42b2-abdf-5f012e45dd27/optiplex_7010_sff_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f76b2c3-c1de-4e2f-8345-d7fcfa635565/93289178163.pdfIn PDF document text
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_9427cd46ddd749c88b274bfaccfaa48d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jaloto/malayalam_album_song_love_policy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1cd3e1c-f302-48e4-b7fb-bda97fb6c36b/35971628267.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_1dd0f22741fa40feac954ae3af48cf93.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pujirageg/wufunidakipazitalepekod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecef5e05-5a5c-4c20-9aa7-83981aa7927b/hard_news_vs_soft_news.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c12c182f-b422-431d-8ae4-04249581a9a3/what_is_microsoft_core_cal_bridge.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/nukekig.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD270 5160 bytes
SHA-256: a046c43b6792ad0eb3d0feedd5438b4091330b8fe2836dc20467149fdcad0fee
font_01_sfnt_off0000e413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 11312 bytes
SHA-256: 13d609f567b43a43d848193d0e38dffe91d54ce0c58b3f9d1b6a4f2224922f89
font_02_sfnt_off00010a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 2936 bytes
SHA-256: 15bb4583f08bc37be742cb5f3b453c970da7c85e48bac29d0143f0cdae2c8f5a

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