Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb97643ddf1071b…

MALICIOUS

PDF

85.1 KB Created: 2021-04-02 17:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4729e1196f493b027658c664f3ecd567 SHA-1: 900b014052b114cf3f6255ac66461e0eda62df10 SHA-256: 1fb97643ddf1071bd0dc495b1eb3555576bc4d871bd93b6d86e1dfe4ad316bf8
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 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=auto+chess+for+mac PDF link annotation
    • https://cdn.sqhk.co/farafakilof/ckgdbe7/80151732240.pdfIn PDF document text
    • http://copyright-notice-ig.com/jolt_word_in_urdu_meaningnw8zv.pdfIn PDF document text
    • http://the-english-temple.com/54818620882crilo.pdfIn PDF document text
    • http://mevesepegubisis.scienceontheweb.net/65715283044.pdfIn PDF document text
    • http://bogplaktnc.fun/joe_pass_transcriptionxu1ht.pdfIn PDF document text
    • http://mudikovarew.mygamesonline.org/ocarina_of_time_great_fairy_fountain_music.pdfIn PDF document text
    • http://todayshop.website/income_guidelines_for_food_stamps_nyclbywb.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/iihbBko/20224845592.pdfIn PDF document text
    • http://genusadnlo.space/4269412488mcqcx.pdfIn PDF document text
    • https://jetujonupukoj.weebly.com/uploads/1/3/1/1/131163664/natuloso-jadego.pdfIn PDF document text
    • http://nugowimabu.mywebcommunity.org/things_i_wish_i_knew_before_we_got_married.pdfIn PDF document text
    • https://paxupodef.weebly.com/uploads/1/3/4/7/134763896/puzekenena.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pakapenabu.atwebpages.com/69895068197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b0e178-c6d3-4083-bc42-3c2cd40ed8d5/what_is_the_texture_of_impressionism_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6c4eb02-2f3d-4d03-9c39-8d2f419bfa52/sony_xbr65x850b_price.pdfIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_4d770785e32f44619f0606575ea6e208.pdf?index=trueIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_03ec8f1a19bb46ab92085606b6231101.pdf?index=trueIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_c07b101f3cbc475ea3a00124afd47f6e.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_c228ef72c9bc4fb7b6679f7a88ff485c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/deb76e59-e325-4ed0-8c9b-0061f1c4c86c/24730237433.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/gedebefu.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_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 2960 bytes
SHA-256: 9e8301a812e0963997f2c69c75bfd39e7fcc44359b8a43baf6657440e065e79d
font_01_sfnt_off0000f815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF815 5076 bytes
SHA-256: ad69f16acf8af2740a3b2870f34cd7069f3055a54a1c19fede0b522de155772b
font_02_sfnt_off0001092e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 11164 bytes
SHA-256: cc59ce728d1f7726d2b892d0c78d0f2b2a7fd99bb40911bc6b59749005e63129
font_03_sfnt_off00012fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBC 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd