Malicious PDF — malware analysis report

Static analysis result for SHA-256 5acd23f190a0c673…

MALICIOUS

PDF

76.0 KB Created: 2021-05-06 02:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21b2e5c8b78f7dcc64d5acb4da22fcb7 SHA-1: 7cff0351d79fd1a1b6673d9efabf4e3fb1aa23ef SHA-256: 5acd23f190a0c673c50541d80566e306a5f3af03578de6b452813459f72e2031
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, pointing to various PDF documents. The primary malicious URL, 'https://xezojetit.ru/strik?utm_term=rush+tom+sawyer+rio+youtube', suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of this document, likely intended to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/strik?utm_term=rush+tom+sawyer+rio+youtube
    • https://gusobukenifoku.weebly.com/uploads/1/3/4/5/134525986/29791513bde20.pdf
    • https://kigilejujagenit.weebly.com/uploads/1/3/1/4/131438309/takiredevoxofogabibu.pdf
    • https://litodamun.weebly.com/uploads/1/3/4/7/134710511/simisomolebi.pdf
    • https://cdn.sqhk.co/wajidafix/crhijiS/2028_olympics_event_locations.pdf
    • https://penukigoguni.weebly.com/uploads/1/3/1/6/131606127/3113628.pdf
    • https://sibanozaniso.weebly.com/uploads/1/3/4/8/134858677/muxatopu.pdf
    • https://gokidobizivoji.weebly.com/uploads/1/3/4/4/134495246/7821980.pdf
    • https://cdn.sqhk.co/temisexezoda/wXkVohh/3d_driving_class_free_download_for_pc.pdf
    • https://divamokavagi.weebly.com/uploads/1/3/4/8/134871471/mogeketovuzuvufe.pdf
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/nixezutetibupimojix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zagipofe.rf.gd/how_to_pair_pioneer_deh-x6500bt.pdf
    • http://tuvufuxo.epizy.com/water_cycle_coloring_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/bae2ec4c-3151-4808-87be-6b217d765c7d/34292062863.pdf
    • https://uploads.strikinglycdn.com/files/9da5bf2b-592c-4251-8191-6aeb9becb7b5/vonogifipodu.pdf
    • https://uploads.strikinglycdn.com/files/a57e0af4-d6fc-4292-a7af-c69cf19a6452/96035594065.pdf
    • http://pogiris.epizy.com/ahmet_hamdi_tanpnar_saatleri_ayarlama_enstits.pdf
    • https://uploads.strikinglycdn.com/files/4fa539ba-f456-4c72-8ec6-64dc40a8c266/redabiluxonom.pdf
    • https://uploads.strikinglycdn.com/files/43e4395f-5078-4e3b-8009-f6d24df0a39d/69270389395.pdf
    • https://uploads.strikinglycdn.com/files/dc9cea23-8561-474f-bce3-26ad23f9c676/how_to_use_dual_bike_pump.pdf
    • http://tojederetesez.epizy.com/1696826514.pdf
    • https://uploads.strikinglycdn.com/files/cdb80224-f43e-431e-b838-d6196a3fd2ac/19438137616.pdf
    • https://uploads.strikinglycdn.com/files/a3a5fd35-939a-4d2c-aa7a-45e369c48ca3/forerunner_920xt_replacement_band.pdf
    • https://uploads.strikinglycdn.com/files/3014c3ca-0398-472b-af2d-c0392a79eae4/where_can_i_get_my_transmission_rebuilt_near_me.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_off0000ec74.bin
85738a3af149944fcf7e581a8a0bed1af5640584ff692d2b47b3170aff83af44
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 5236 bytes
font_01_sfnt_off0000fe29.bin
e784ac6817ce7410b0bc73d40484b5564ee856723b30d085b907f693abf188d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE29 10760 bytes