Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f90631c40514181…

MALICIOUS

PDF

79.9 KB Created: 2021-03-18 09:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: dec5acad3e159803635df2d896ded180 SHA-1: 5a97b5f5c28c4c36a298f99ba2cbb9481027c701 SHA-256: 5f90631c405141819e3d6089e50c3ecef8e5924532b4c76fcab65d2d0cf95e00
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/aws?utm_term=game+of+life+rules+2020+pdf PDF link annotation
    • http://hookup157.fun/aramaic_english_new_testamentfqssf.pdfIn PDF document text
    • http://winoraama.site/french_vocabulary_words_for_beginnersv1ddm.pdfIn PDF document text
    • http://tpdreport.com/rixefujudijadudefekofipen1j6b.pdfIn PDF document text
    • http://moitender.org/web_service_rest_api_salesforcepwtkn.pdfIn PDF document text
    • http://contentmedialiteracy.com/jexiguwireou0x0.pdfIn PDF document text
    • http://pelistens.xyz/tc_helicon_harmony_singer_1_vs_2l2lau.pdfIn PDF document text
    • http://yourdesk.website/jawegigujolekesadojufuurdd.pdfIn PDF document text
    • http://stixlife.info/neverwinter_oathbound_paladin_build_mod_16scef5.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://s3.amazonaws.com/nerugiraxura/zirarununive.pdfIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_c58e8ce370de4ee58efe327abeacc605.pdf?index=trueIn PDF document text
    • http://vamuxusonepuf.rf.gd/how_to_code_in_computer_science.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/48724508065.pdfIn PDF document text
    • http://joluromimazatub.epizy.com/dead_space_para_android_gameplay.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/10199070300.pdfIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_76516f3bc0d745c294fd359926b7dbc8.pdf?index=trueIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_902a430296c540089bfd13f4cbfdeae3.pdf?index=trueIn PDF document text
    • http://nanaxaj.rf.gd/putez.pdfIn PDF document text
    • http://zemorenoduw.epizy.com/first_world_war_history_in_tamil.pdfIn PDF document text
    • http://xofoxunun.rf.gd/dafupata.pdfIn PDF document text
    • http://guzeberipavol.rf.gd/traducir_latin_espaol_gratis.pdfIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_ba4db38db0e445349385acb37968ed32.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_off0000eb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 5188 bytes
SHA-256: 17ee216fb8539ca548f4a7f523728c5acf46b8ae62089883dd202987984d98f1
font_01_sfnt_off0000fd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD12 11256 bytes
SHA-256: 9efd222f0429ce65b24ac99192be0e3255e5993409494aceb716e074d17dcbbb
font_02_sfnt_off000122df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361