Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdccd9587af1c9b…

MALICIOUS

PDF

77.5 KB Created: 2021-03-16 01:54:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 252132b7f704b2546223ff7916e0f720 SHA-1: ba7c5ac40567c2287afa4c1d15760f73823bd997 SHA-256: 4bdccd9587af1c9b91421eba44f7299bc9e769e21d1eeb0bc09dc048fc453e82
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 often used for SEO poisoning or to direct users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wix?keyword=chevy+tahoe+forum+2018
    • http://wordwild-store.com/aprender_latim_sozinhoth5f3.pdf
    • http://topafigo.mypressonline.com/vizabetefibipobujoniwap.pdf
    • http://rejasikega.scienceontheweb.net/craftsman_18_hedge_trimmer_blade.pdf
    • http://gladkoe-telo.xyz/dobagex4824x.pdf
    • http://tikovg.xyz/zosowu6hba4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://radiviwix.onlinewebshop.net/what_to_do_with_grape_jelly.pdf
    • https://s3.amazonaws.com/fofeguj/z_statistic_table.pdf
    • https://s3.amazonaws.com/julaxel/84329328066.pdf
    • https://s3.amazonaws.com/jolunenafobuw/18167619053.pdf
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_0cf24defecc74fc8b2ff4100fa94c686.pdf?index=true
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_1259f3cd350641398106371363421e86.pdf?index=true
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_b48f228ad12d414cbbd7cc10edfdbe28.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b80a9063-7be6-4532-94a1-c98d540ed5cc/lipasatineruri.pdf
    • https://s3.amazonaws.com/pasawexawinogad/samsung_55_inch_smart_4k_ultra_hd_hdr_qled_tv.pdf
    • https://uploads.strikinglycdn.com/files/4ad6f549-fba1-4b08-a62f-f51932942a4a/dell_precision_m4500_bluetooth_driver_windows_10.pdf
    • https://s3.amazonaws.com/siwixomudit/bony_to_beastly_war_chest.pdf
    • https://uploads.strikinglycdn.com/files/5ea3b4d2-5770-4661-bc8a-fb00099d1279/how_to_change_the_display_name_on_a_norstar_phone.pdf
    • https://uploads.strikinglycdn.com/files/9a0b5531-42d9-42f2-818f-dc8cb6afa0c7/amplificador_de_audio_para_casa.pdf
    • https://uploads.strikinglycdn.com/files/8f9d1882-0d8b-4acf-9f38-623119e4ca8a/what_if_my_blood_pressure_is_120_100.pdf
    • http://putunoxixowelo.atwebpages.com/translate_chinese_to_english_online.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_off0000ef59.bin
10335578e944ea867c53e2ca5db9424ac6c4e24ab4572fe10334fa1b599315d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 5384 bytes
font_01_sfnt_off00010190.bin
b7e01e9b902ac3d9b179e2b8774682c1c0665386b68ee616193cea3e69299559		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10190 12712 bytes

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