Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3871989bc035cd5…

MALICIOUS

PDF

77.9 KB Created: 2021-04-08 03:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 216fa2ad3320247c2f525c7fa0da8e2b SHA-1: 8855504b2198981a25b0752e1dabae5379f53d63 SHA-256: b3871989bc035cd5ea39356f0d512feb17f9720f032858d3f9b5e835bbefdf51
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://druttle.ru/strik?utm_term=how+do+you+remove+a+grohe+kitchen+faucet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4530429/normal_600ed3e45eaa5.pdfIn PDF document text
    • https://cdn.sqhk.co/tusifefovozu/X7gfngc/ampx_music_player_beta_download.pdfIn PDF document text
    • http://metiwizonud.getenjoyment.net/appointment_request_letter_for_business_meeting.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_6016f314d1373.pdfIn PDF document text
    • https://cdn.sqhk.co/kuderoxuz/K3jbij9/diet_shakes_breakfast_and_lunch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376126/normal_6050ea25a1901.pdfIn PDF document text
    • https://cdn.sqhk.co/nibijegun/sidjcOR/betilivuvirowasozuzaveda.pdfIn PDF document text
    • http://kefudepoduwudi.sportsontheweb.net/apopleja_hipofisaria.pdfIn PDF document text
    • https://cdn.sqhk.co/burajugi/fjhC7VD/zoom_cloud_meetings_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/lhjdhaF/83283636269.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/fisica_balistica.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/giSg1tO/kungfu_heroes_app.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/gigpxob/4164752673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497646/normal_6055020b3125a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465941/normal_605f4e8a528f9.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/metal_melting_point.pdfIn PDF document text
    • https://cdn.sqhk.co/luveruzosu/b1jdsCF/whack_your_computer_15_ways.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/008b5b5a-ecca-4863-ae22-72a220105f5b/antennas_direct_clearstream_2v_tv_antenna_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb5833b7-4a19-4e5b-b7b8-936bab14265e/xoripufijasobijelonefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61222ac6-178b-4ba6-9c76-b70c7be9ecae/what_is_the_best_nursing_drug_handbook.pdfIn PDF document text
    • http://zozupajekuledus.myartsonline.com/10684210233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03010029-514d-48a1-808c-b913b7e9e3ab/41749719567.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_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 5504 bytes
SHA-256: ecbbff4d4e4c80905587806ddca36fc64fb950ec29bfbdcdb21876906dade02d
font_01_sfnt_off0001076e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076E 10104 bytes
SHA-256: 7923edf017c5401d15c0571b4405806ed10d5661f6c30fc2537d299765fff71f

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