Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5cf66ae82aff06…

MALICIOUS

PDF

76.3 KB Created: 2021-03-17 21:23:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1375d496a6ba7fe3f1ffbb0aef8bc02 SHA-1: 17324ada079e8e47c0d1cc8e0b61c5f1c7b8baae SHA-256: ca5cf66ae82aff066eb2f2172543811e0deab1abe01a13b10f00e0bdb3f39a5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a mass external link farm, with one URL specifically appearing to be a lure for users searching for IP address information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/aws?utm_term=how+to+change+my+computer%2527s+ip+address
    • https://cdn.sqhk.co/dabozijide/wk2gfhi/premier_league_football_players_names_a-_z.pdf
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/8906131.pdf
    • https://cdn.sqhk.co/mibazudifij/q3bthdc/garerivozofevubire.pdf
    • http://dojemop.mywebcommunity.org/admission_list_of_colleges_in_karachi_2020.pdf
    • http://orbitan.fun/66307057361bjrer.pdf
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/sipefojume_xavawi_wibivegevipu_tagaluv.pdf
    • https://tuzafezinaxav.weebly.com/uploads/1/3/4/3/134319976/gesidekopo_xotolafuz.pdf
    • http://vedivux.mygamesonline.org/the_complete_yoga_anatomy_colouring_book.pdf
    • https://cdn.sqhk.co/webuzifinuno/mghiehd/dizuvutetezen.pdf
    • http://seomagnat1.online/1527827334246jjf.pdf
    • http://drnextact.xyz/rupinder_gandhi_2_hd_moviez4osb.pdf
    • https://cdn.sqhk.co/gusiloxi/i8haMgg/drum_sets_amazon.pdf
    • http://bejisosubonito.sportsontheweb.net/a_view_from_the_bridge_themes.pdf
    • http://barashik.space/71213957894ap5ir.pdf
    • http://car-test.pro/fiwurerimivepusoyhkiy.pdf
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/zixikuzolik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0b19dfcd-8234-4aad-b878-5eec7399ef9f/3461754650.pdf
    • http://pojoviraxerojo.myartsonline.com/software_quality_assurance_job_description.pdf
    • https://uploads.strikinglycdn.com/files/cfefeb5c-d2ad-4971-9789-23f567917ea0/how_do_smart_scales_measure_body_fat.pdf
    • https://uploads.strikinglycdn.com/files/231cacf9-7ff6-4fbd-9a16-c425006f1ed8/full_vhs_tape_the_trumpet_of_the_swan.pdf
    • https://uploads.strikinglycdn.com/files/93a54c38-0220-4430-849e-867a35c2db92/what_day_is_adoption_day_at_petco.pdf
    • https://uploads.strikinglycdn.com/files/db0cb94e-aef3-4dcd-ae64-44389cd1da91/41609282224.pdf
    • https://uploads.strikinglycdn.com/files/5bde01db-8270-4695-842b-95f5af0faf06/3099645133.pdf
    • https://uploads.strikinglycdn.com/files/818fe089-eef7-4330-b448-d317cee9480e/74521297288.pdf
    • https://uploads.strikinglycdn.com/files/ed70d36a-2cf9-41b9-8878-b0fd0d74f057/bizisipepuvow.pdf
    • https://uploads.strikinglycdn.com/files/d877af0f-e41e-4aa7-a341-cbd100f8b9a7/50916947465.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed12.bin
656382bc5dfd4f2dcab4826d8e8abb6e5a163a9efc176726ef63bbf9a5a94e98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED12 5644 bytes
font_01_sfnt_off00010041.bin
a7e5013d5bd0cdd222441d964d6590c789bffe7d658b63b4cedf4956600fe6fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 10160 bytes

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