Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a6c8c0ff4f7325…

MALICIOUS

PDF

126.6 KB Created: 2021-03-21 00:45:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 22588f634cbba5761b220065861ed18a SHA-1: a64660970918088632193c39b08aa0826fee4a92 SHA-256: 71a6c8c0ff4f7325f8efe2ecbdd33970a521a50b8c54094be5b58ced16e6b9f1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a fake browser extension or update. The presence of numerous external links, including one pointing to a potential link farm, suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://druttle.ru/123?utm_term=making+indecent+images+sentencing+guidelines+uk PDF link annotation
    • https://cdn.sqhk.co/jofutagi/mLsjaVO/art_of_war_legions_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/hg3hchj/evacuated_container_meaning_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/molivovuki/5ljcChe/top_100_bollywood_songs_download_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/gishghh/86474616873.pdfIn PDF document text
    • https://cdn.sqhk.co/gobefuvumi/iebjjD4/flow_free_bridges_jumbo_rainbow.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/fneUqhc/copperplate_alphabet_template.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/ifaqgib/xixusipevajowumupoxel.pdfIn PDF document text
    • https://cdn.sqhk.co/todipageb/ic2Tjeb/hidden_secret_codes_for_samsung_android_mobile_phones.pdfIn PDF document text
    • https://cdn.sqhk.co/velomegu/eiejfii/live_cricket_score_world_cup_2019_today_video.pdfIn PDF document text
    • https://cdn.sqhk.co/naludibeg/fjdgijg/300_east_front_street_traverse_city_mi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://28ff6ca2-2414-4e74-9e8d-c1b7aefbe223.filesusr.com/ugd/c4f63d_4efb7c7dfd93455f8048380f31fc97cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d4eecbe-2e89-4601-bbcb-88859eedea87/the_wrong_house_story_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/what_is_the_weather_for_washington_dc_on_january_20th.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/nikenukiz.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/jopudaruwigisisib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/549bc802-aae5-4173-be4d-6e833f1e979c/damedezemusurofiga.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/telekom_austria_group_annual_report.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_a5916792f5e04e758807c44a65db6d28.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff12f61-10bc-4493-99ff-1e0ce60c8cd4/32134535994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d69449d5-8975-4ea2-87fb-abb6e48631a9/basic_trig_identities_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c42822f2-f756-44ed-9c05-c67831bba473/valor_de_reloj_timex_indiglo_wr_30m.pdfIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_00fd5bfc4ab24018be55323cacd7640e.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4D4 5232 bytes
SHA-256: 8d41010e4e49d14e5a46fe874d2c398c36bbcd091b607f5b72a5433db7bc522b
font_01_sfnt_off0001c6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6A4 10912 bytes
SHA-256: 9d562959809b409d671972ece96a73efed7cd4fd38d5153d577920e039f13f54