Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8251b67605cd580…

MALICIOUS

PDF

71.9 KB Created: 2021-03-18 20:17:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 803fa996cd6bc5a3a9013638ad2424dc SHA-1: c83be0e8c42e065b89f463575459782db6e571e4 SHA-256: f8251b67605cd5803b6b26b82b9cb84635c0fe3805f1229b094cd85580d9587a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, with one prominent URL pointing to 'gimoguvi.ru', suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm designed to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/123?utm_term=proportional+and+nonproportional+graphs+worksheet PDF link annotation
    • https://cdn.sqhk.co/bijozugetav/jaHhIhj/xesepelitofetibepuse.pdfIn PDF document text
    • https://cdn.sqhk.co/mewixamok/gjiGZje/video_game_car_racing_free_download.pdfIn PDF document text
    • http://ttttrrrr.space/tirelibubejakuxudex0sced.pdfIn PDF document text
    • http://finansi-7.online/14372424564u9f54.pdfIn PDF document text
    • http://azorocheat1.xyz/bewalarggul.pdfIn PDF document text
    • http://findssldz.xyz/computer_networking_basics_tutorialygqjg.pdfIn PDF document text
    • http://ragukir.iblogger.org/what_does_quarterly_report_means.pdfIn PDF document text
    • http://subfamjtii.site/apple_magic_mouse_2_ios_13.4t9p2v.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/joghiiM/mortal_kombat_11_krypt_character_unlocks.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naremijex.epizy.com/fimisawimetupuxude.pdfIn PDF document text
    • http://vujiwexamofone.rf.gd/lonely_planet_guide_thailand_free.pdfIn PDF document text
    • http://pixagikaw.epizy.com/7_elements_of_music_worksheet.pdfIn PDF document text
    • http://likijanima.epizy.com/dujanoxajarukazebiro.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/4276481234.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/babbu_maan_all_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/is_simple_tax_safe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d316f5a4-9bad-4e4a-b698-8eb4d93da99f/lenovo_thinkpad_t430_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/tikuve.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/pokusituwoganu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1211297b-a76f-4fb7-be63-4e8746c2bc7e/annie_john_book_online.pdfIn PDF document text
    • http://suwulinivez.rf.gd/43792237600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6751fa4-f1b9-4676-a18e-cde2f7bda724/fufamedaxag.pdfIn PDF document text
    • http://pevoxetawalob.rf.gd/63689024929.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 5380 bytes
SHA-256: 86d276d34746e37df4d7d71189aeecee113b995dc2d8d9f78478747fb03653f1
font_01_sfnt_off0000eca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA0 10776 bytes
SHA-256: e3fa05b2211047dfb569b329c8924a52350c2131fe5cb4e1c4bd089bd158cc76

Open this report in the interactive analyzer, or submit your own file for analysis.