Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d935fe6cfa71da…

MALICIOUS

PDF

85.5 KB Created: 2021-03-10 02:47:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3303af2c151ed2e43282b5770345020b SHA-1: b33a466aeca831a86a211c19724f004563fb79e5 SHA-256: c3d935fe6cfa71da5ae3911106dde2cb4fa77d50c930f7af59eb41e738ef5bf9
186 Risk Score

Malware Insights

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

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 0.9994

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://bologen.ru/123?utm_term=bole+chudiyan+video+hd+song PDF link annotation
    • http://gogemupiru.22web.org/android_one_phones_nz.pdfIn PDF document text
    • http://dexowowijovovu.iblogger.org/nofamuvukijubire.pdfIn PDF document text
    • http://giwewigipebi.medianewsonline.com/naruzifepow.pdfIn PDF document text
    • http://tesekal.mygamesonline.org/how_to_change_oil_on_kubota_svl75.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_2ff26cce1f3145f487187aa948273dd2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kofabube/linux_networking_cheat_sheet.pdfIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_928f7a942a3e4c7c9874014de144f0a4.pdf?index=trueIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_d6face28d61f4e7386d23ceebb8f9ef4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/98211558194.pdfIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_5773d462214e41748e53bfe91d57c007.pdf?index=trueIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_8ee37abeb24248dd8afe1e8bec9ef2c9.pdf?index=trueIn PDF document text
    • https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_97f664c268ac4f21bd1c8eb32a0890c5.pdf?index=trueIn PDF document text
    • http://wixudilasajigil.rf.gd/56749191754.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/math_integers_practice_worksheet.pdfIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_e82186265bbe430fb3f1faf3cd14e3c2.pdf?index=trueIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_a1809a7f3ebb406fbd775568eb32864e.pdf?index=trueIn PDF document text
    • http://xubibufopude.epizy.com/8240982130.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/burris_eliminator_iii_user_manual.pdfIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_1ac8648f23f946e8a42670ac586fd43e.pdf?index=trueIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_5847d570511c4deda10483ccf231c858.pdf?index=trueIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_a55553a9515e43ee95ab35e05f3d4664.pdf?index=trueIn PDF document text
    • http://tulupewovevola.rf.gd/project_costing_template_word.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_ad60d5f2a7f946c6a43239fbe2e8a554.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_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 5316 bytes
SHA-256: 160a78c6b8f49970bcdcc308e6b3fd99aa1c64cf22a03ba34e7727713b811c0c
font_01_sfnt_off00012565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12565 10288 bytes
SHA-256: 56b3e9b8a6ff60070cd1f8eabc0b62fadf892ff9de2ae5e5fea09a7bc5d285db

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