Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8f9bbffc05aa0c…

MALICIOUS

PDF

75.4 KB Created: 2021-04-01 04:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7119a0c0de8c3a4fd7f6a5af89013e7 SHA-1: bab22144693f7d20c99afb9dde2f3430773b6d9e SHA-256: fa8f9bbffc05aa0c49191e2933b2e8b6699ecdf8071726c76e6370d805a43360
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. The primary URL, https://lozipotod.ru/wix?keyword=groundhog+day+worksheets, is likely part of this scheme to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/wix?keyword=groundhog+day+worksheets
    • https://sujabowumosof.weebly.com/uploads/1/3/1/3/131398195/xedivon.pdf
    • https://fotaluxig.weebly.com/uploads/1/3/5/9/135973299/kupufumusotiwatiru.pdf
    • https://damusabuweko.weebly.com/uploads/1/3/4/6/134609075/gibapa_xefaxen_rubevak.pdf
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/jizikunudolat_lazun_midabajod_fapevosa.pdf
    • https://duwobimisenuzo.weebly.com/uploads/1/3/4/6/134615726/8cca770b5e13.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/rijaliwiguvex/all_star_basketball_hack_apk.pdf
    • https://s3.amazonaws.com/dugibabafod/birthday_wishes_song_pagalworld.pdf
    • https://s3.amazonaws.com/fapaga/what_does_free_time_mean_in_spanish.pdf
    • https://uploads.strikinglycdn.com/files/99748cd6-a221-4bec-84bc-b960170c12b6/stephen_king_the_stand_movie_imdb.pdf
    • https://s3.amazonaws.com/nefomojuwet/36421768275.pdf
    • https://uploads.strikinglycdn.com/files/6d5c8a51-3eee-41b5-9ae7-a108aeef3cee/foladedujep.pdf
    • https://uploads.strikinglycdn.com/files/47f20bd9-2fd4-45fd-b72c-e60e4ecb6738/how_to_clean_drain_pump_in_washing_machine.pdf
    • https://s3.amazonaws.com/fapaga/object_pronouns_worksheets_for_grade_2.pdf
    • https://uploads.strikinglycdn.com/files/08c9f5e0-f8f3-401f-bd0a-381528336d0d/pezatimoposelalifik.pdf
    • https://s3.amazonaws.com/loranoduzuja/medical_spanish_app_free.pdf
    • https://uploads.strikinglycdn.com/files/defaf553-fd80-4e9a-a50d-a52c90f75194/nusug.pdf
    • https://s3.amazonaws.com/napejaxosinages/22590869008.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db11.bin
a75b2d9a28b77e9c39c5dceada7c8cf8ea1fab22ad1819ba68baae17d046e0d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB11 5176 bytes
font_01_sfnt_off0000ecb8.bin
768445f57d9a9cd0c4750b78478f01fe54d231a8977731e53edc72b546ef1639		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 10756 bytes
font_02_sfnt_off0001114c.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1114C 4324 bytes

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