Malicious PDF — malware analysis report

Static analysis result for SHA-256 629fdc4704fd0eaf…

MALICIOUS

PDF

80.0 KB Created: 2021-03-31 16:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8bc9012fb8d6c46841e4bb43c229d2ab SHA-1: ed72af81c60629811ca6e878b44aee88b8edbfec SHA-256: 629fdc4704fd0eafd8e2d976dc9fd21b28e37dcf3289838f35399326077a59d4
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm designed for SEO manipulation, containing numerous external links. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The primary malicious activity appears to be directing users to potentially harmful websites, as indicated by the external URI firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xajibur.ru/wix?keyword=the+bonesetter%2527s+daughter+review PDF link annotation
    • http://domen3.club/bofifoxrgyy9.pdfIn PDF document text
    • http://8bitbeardsco.com/mivutigefatidelir5tph3.pdfIn PDF document text
    • http://itanah.space/best_student_award_certificate_formaty1f5q.pdfIn PDF document text
    • http://kukushka.space/4757041857565h65.pdfIn PDF document text
    • http://xukigebek.iblogger.org/complex_sentences_worksheet_high_school.pdfIn PDF document text
    • http://white-x.fun/the_red_pyramid_series_book_2b0exf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b6a52c76-0eae-496a-be96-ecc7bc85ef9d/mercruiser_5.0_mpi_oil_change_kit.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_e46d32cd40024942888ac75691648ae9.pdf?index=trueIn PDF document text
    • http://pezomovororiz.rf.gd/netgear_wn_2000_rpt_v2_firmware.pdfIn PDF document text
    • https://37cc4ef3-276f-49d0-84f3-8bc08bbde6a9.filesusr.com/ugd/e4a5d4_dee4d1c72bf54358b2c8365f18be7059.pdf?index=trueIn PDF document text
    • http://lugirike.epizy.com/difikunabogajajew.pdfIn PDF document text
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_38b56b9320094a9eb869909012a19a1e.pdf?index=trueIn PDF document text
    • http://wigamezula.rf.gd/what_is_a_gnosticism.pdfIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_8296718af5b548e5ac039dcb6866abaa.pdf?index=trueIn PDF document text
    • http://zuzofigub.rf.gd/game_of_thrones_9_season_2020.pdfIn PDF document text
    • http://fejivexol.epizy.com/43426764050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a50cb89a-0a9b-4ea3-a9a1-f132282a5fd2/kujatuwiwog.pdfIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_8c25600909974c50807b7f4ef9cd5670.pdf?index=trueIn PDF document text
    • http://jolijugidepim.rf.gd/paxazemusakaduvedeje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0db41d9-9370-42cc-ae90-eb10028b32e8/potty_train_in_3_days_or_less.pdfIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_0ec530d144de4487959c16ae56850591.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE6 5212 bytes
SHA-256: 6ec117e5d631446349a58d19c22e0dac7f7402e74922dac62357f34d74717ae5
font_01_sfnt_off000100a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A7 10352 bytes
SHA-256: 3af52d7528536c9aed311516405c114fdbecf415152bd8582195997e344a55c0
font_02_sfnt_off00012430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12430 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333