Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c153f3277d68d51…

MALICIOUS

PDF

98.6 KB Created: 2021-03-25 07:04:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e66baabadeb7eea8f6d6778fb24cfe03 SHA-1: c154c14f733c6696ff5891d66361e6cd91a32943 SHA-256: 8c153f3277d68d5162c8e587598863af8ac74f7b6495a61e89976538b5017ca4
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicating a link farm designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to attacker-controlled infrastructure.

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.
  • 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/award?keyword=career+guidance+after+12th+science+pdf+download PDF link annotation
    • https://mosuvixixe.weebly.com/uploads/1/3/0/9/130969854/wofiwosilebu-xagevirurow.pdfIn PDF document text
    • https://gubaxuxozixiviw.weebly.com/uploads/1/3/1/3/131383744/339c506aa96.pdfIn PDF document text
    • http://lufawobakisi.22web.org/gupikagapevived.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365619/normal_5fee0d13a09e4.pdfIn PDF document text
    • https://gusijanuvo.weebly.com/uploads/1/3/0/8/130874241/pusotag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_60465ac8e2b9f.pdfIn PDF document text
    • https://bebiluredop.weebly.com/uploads/1/3/3/9/133987060/3597298.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lakadutof/82232890719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fca00d3-3d5d-4d8b-acac-8bc3d05544e9/lasagewesekivivabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7adbe359-ef8f-48c8-a21c-1ae39dd9ebfa/71198341777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87f4c061-e36d-4d2c-9b99-88fbf1f3703a/25199320842.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/28715498308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b615f0-e245-413a-8966-a6fd08aeee4b/xizarexodokarawena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0024b34c-75fe-4632-9363-6dee76c98725/is_forrest_fenn_still_alive_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/136aff11-8494-428d-917b-821b3dca3096/goal_setting_forms_for_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d31b5de7-8bff-49cf-a936-b6584105d09a/how_to_install_programs_on_ti_nspire_cx_cas.pdfIn PDF document text
    • http://bumosutu.rf.gd/fuwuxutetesilazubatazate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cd54f66-3771-4381-a33f-5d282accb2cd/bowopawiduwitudujonunex.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/clarinet_sheet_music_for_silent_night.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12374 1916 bytes
SHA-256: b4ab305c7633fb3c8c791879c130f8d49cfaaca324c517981044611fd13be352
font_01_sfnt_off00012caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAF 5600 bytes
SHA-256: 0c41e55e491e808443373d25d285560b6229ee3591d2ead35e083bb9a4777d30
font_02_sfnt_off00013fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD3 10932 bytes
SHA-256: 456caf1efd5a09979dd44b0378f1a8f433c24078766e19d2e609c972998e361b
font_03_sfnt_off00016550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16550 16172 bytes
SHA-256: 96e06106e3006553386fba87c243c4a28b622411f61b38071404873282de63a9

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