Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce1d26c99b07ecf…

MALICIOUS

PDF

111.2 KB Created: 2021-04-06 07:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f31743452c956724e64891aad5f33198 SHA-1: e8c62911f04b20f733a09c73ac0b7f7841c56ac3 SHA-256: 2ce1d26c99b07ecf2f5e55510023b3b17420424c8cfc384af754e0074690d22c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique commonly used in SEO poisoning and phishing attacks to direct users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to lead users to compromised or malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/award?keyword=aberystwyth+map+pdf
    • https://cdn.sqhk.co/totudavomud/ThfJ2ji/luvuwuvalotufijumig.pdf
    • https://cdn.sqhk.co/zevinikiwi/ibjbFg7/how_to_iron_on_patches_on_shirts.pdf
    • http://wewofif.scienceontheweb.net/dell_optiplex_790_bluetooth_driver_windows_10.pdf
    • https://cdn.sqhk.co/nalawanuxa/VUjeiaJ/guide_for_zombie_tsunami_2020_wiki.pdf
    • http://vexekene.iblogger.org/john_deere_lawn_mower_battery_gy22113.pdf
    • https://cdn.sqhk.co/supetudoti/aKYt8ij/62097446884.pdf
    • http://warewakeb.sportsontheweb.net/82431146721.pdf
    • http://tipijijajofupi.sportsontheweb.net/asian_cup_2020_fixtures.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2c368c7d-9006-4ce9-be8e-6b10e470903b/kemetajetisuwosetamujizaf.pdf
    • https://uploads.strikinglycdn.com/files/0391c5ae-f2dd-49ff-a5a2-d3f36ba25529/98932317254.pdf
    • http://kisalonokexiwi.atwebpages.com/fevabuvosejivizezuni.pdf
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_65bfc014e73345d1bfc1d4680bae7d1c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e76e2a10-8682-41a2-9f85-4868a89e79eb/hyundai_sonata_hybrid_maintenance_schedule.pdf
    • https://dcaf3b11-26f0-4e60-b842-01857b8e1462.filesusr.com/ugd/2df88f_8e829359abe94ecf83b5550f3d114878.pdf?index=true
    • http://rixigor.onlinewebshop.net/5562336820.pdf
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_6c4910339d0a4ad883263079adec5a76.pdf?index=true
    • http://gulogomolu.rf.gd/english_worksheets_for_kindergarten_2.pdf
    • https://uploads.strikinglycdn.com/files/c5b45077-c824-4a5d-b624-dae466dee719/83453467339.pdf
    • https://uploads.strikinglycdn.com/files/e64b3b56-ff02-4c97-8229-8cf9e5aaf23f/97124460122.pdf
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_808470e8434349978c7f0fb704f8d851.pdf?index=true
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f01c.bin
544edafe98a58f52086fc8590a60598f59552ffb5cf7edc8f45eaac86b171da2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 39128 bytes
font_01_sfnt_off00016829.bin
9500418efaa0a545fbe9a2d6a852fa4f50be3959ad719361a5e8970aca2d7c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16829 5572 bytes
font_02_sfnt_off00017afc.bin
0b0b60f7ee493458466d2ab00f2b6d7b9e57c8a987d59773a0935645a7777da7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17AFC 2920 bytes
font_03_sfnt_off00018690.bin
ac501c99f78f510f1d3c68a008d3d2f6d9886433a7577a02820d7a6d4c0a567a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18690 11836 bytes

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