Malicious PDF — malware analysis report

Static analysis result for SHA-256 51bcbdbbd4235abe…

MALICIOUS

PDF

74.9 KB Created: 2021-03-31 22:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bb1d6c62b799533d5e0e6faf4e4aa4a6 SHA-1: 72052eaeadb4e51549c7f555a4ebafea0babb4d5 SHA-256: 51bcbdbbd4235abe62075b5b7bc5c9b822dd44289c3105139ccea660ab52dc49
194 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 ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9991

Heuristics 7

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dugedepap.ru/award?keyword=oregon+trail+map+pdf PDF link annotation
    • http://muzibatixabu.mypressonline.com/what_are_good_books_for_14_year_olds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496826/normal_600b2dbd863c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427105/normal_6017ceffb543a.pdfIn PDF document text
    • https://wirimodarezekas.weebly.com/uploads/1/3/5/3/135314182/kimiposarozutakariza.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/english_dictionary_app_for_android_without_internet.pdfIn PDF document text
    • http://kesisofawa.mygamesonline.org/sears_kenmore_sewing_machine_model_number_2142_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467300/normal_603291108d784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416805/normal_605b9bfa47661.pdfIn PDF document text
    • http://sigixexizo.sportsontheweb.net/geometria_analitica_nel_piano_formule.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481539/normal_5fff956eb38f2.pdfIn PDF document text
    • https://pulivaxudifosaj.weebly.com/uploads/1/3/4/2/134235984/neriduforufuler_keteru.pdfIn PDF document text
    • http://vuvodagedene.scienceontheweb.net/24588996718.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9196fa4-0195-4c66-a050-8c7384b6810b/why_did_my_baseboard_heater_stop_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f4d8b5b-cb2f-480e-8939-15a9a75fdc0d/what_is_tropical_climate_tagalog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b208d330-5377-412c-bab2-ac46680b8528/molecules_of_emotion_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a348313-b564-41c4-9053-0e08d7706cc3/wumedijisoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd29649-858f-4c18-835e-4a7fd82c0ea8/how_to_find_the_most_luminous_stars_are.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/navidobijovozukuvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9183d8de-d243-435b-b09c-8bbf34cc5df8/why_cant_i_update_my_samsung_smart_tv_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5839b982-56de-4b65-81b6-29483d1555b2/how_much_does_corian_cost_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfe61745-49cd-4cc1-8431-bf3bd16c559a/39325894363.pdfIn PDF document text
    • http://litorow.myartsonline.com/visujomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13987dae-75f0-4d77-aaa0-43b2b878f92a/73791541628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bc11a3c-6b42-4f8a-82d7-26249d1dd66b/free_wordpress_themes_for_business_blogs.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_off0000e83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 5212 bytes
SHA-256: 14f4382eadfd19bfabdb0006e742c1656b0c7080bc6e9b96cf95c69877a5119a
font_01_sfnt_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 10772 bytes
SHA-256: 8ccb0f87c770a30984834c6b5c5fca00925330f80c61dea4e5e06ecb6d20e523