Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b710f02f92484b4…

MALICIOUS

PDF

101.1 KB Created: 2021-03-09 08:09:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b6e90bdfd7bdd428dd39e2b601965a82 SHA-1: bdb46d9d1bf5b0535367018dadeb370ba929bdc9 SHA-256: 8b710f02f92484b42045df76f4216bb59f766b09419fc80d0e29f8d6dd611e4d
126 Risk Score

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 0.9988

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://jumiwimov.ru/award?keyword=ayatul+kursi+in+arabic+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5ff36c51cbac2.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/xunewumawig.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/after_we_collided_release_date_netflix_usa.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/zefaparudiruxib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501514/normal_5fcb70b873023.pdfIn PDF document text
    • http://jusojixanona.getenjoyment.net/55208427318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501027/normal_6019ab2ce4432.pdfIn PDF document text
    • http://bibivire.mygamesonline.org/rigiburabonibovusugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_60158e5f72b80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426945/normal_5ff79883ce570.pdfIn PDF document text
    • http://rutekotugu.22web.org/festivals_and_celebrations_around_the_world_worksheets.pdfIn PDF document text
    • http://fudazozotakaxal.mywebcommunity.org/wafujaterodafutixujojin.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/b466f358-0066-4aa0-bde0-b6282f3f83e2/honeywell_8000_setup_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd70d8d-5b1b-453e-893d-e69bddeb18e3/fisakizidaguti.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/adjusting_journal_entries_in_quickbooks_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f172846d-3c5c-4bcf-a6e6-d58e6ddd3439/autocad_lt_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a4c9521-f049-4ad5-becd-f7afadd66449/tifuxutakafisenuzuwafag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73641327-4403-4479-b72b-1b007f8e80e8/75190415824.pdfIn PDF document text
    • http://banobozibijur.epizy.com/how_to_open_hisense_air_conditioner.pdfIn PDF document text
    • http://jowosos.myartsonline.com/taylor_ice_cream_machine_manuals.pdfIn PDF document text
    • http://javajese.epizy.com/bbc_good_food_guide_cheesecake_recipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94b9815a-bd6c-48ab-a442-04314bc3f24e/bukux.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015512.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15512 26280 bytes
SHA-256: d5a7936a8b0c61fd281e28bbc3f02aee85dbfbf1790d45964eb3b6f993f75a4e
font_00_sfnt_off00010bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBC 7000 bytes
SHA-256: c4055df0960568c9fe7516bf10d74b7eca9e6decca272c1ff1f25f8e7bfefc38
font_01_sfnt_off00011d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D50 5444 bytes
SHA-256: 770368e6637cb6c1553e381c51f089c4bfca9bee25c0cf2c88ffa31744bd6716
font_02_sfnt_off00012feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEB 11224 bytes
SHA-256: e4775f856860427330028745417a53483aff3fd11b5527926894ffab24c39462