Malicious PDF — malware analysis report

Static analysis result for SHA-256 b756507ca5a959d8…

MALICIOUS

PDF

85.6 KB Created: 2021-03-21 04:58:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bc5e57313b6f49a54b0d9f4d547f816 SHA-1: 59de8931cb9171af832194810a4b49b092ab67e5 SHA-256: b756507ca5a959d8fd9ff0f06d5f3aadac5b5179e9a7e226fac9f046553fc7d8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a URL that appears to be part of a link farm designed to improve search engine rankings. This, combined with ClamAV detection and ML classification, strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=adobe+audition+full+tutorial+pdf
    • https://jokunotewe.weebly.com/uploads/1/3/5/3/135314966/481ecd6be51f415.pdf
    • https://mototide.weebly.com/uploads/1/3/2/7/132710683/wegok.pdf
    • https://cdn.sqhk.co/voxobidivel/sghhgji/57891651811.pdf
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/dokodadoluzur.pdf
    • https://cdn.sqhk.co/jeporikate/ii4GhfJ/zig_zag_railway_station_lithgow.pdf
    • http://munasimowijuxi.getenjoyment.net/96469191038.pdf
    • http://foramodosug.mygamesonline.org/animal_farm_next_to_me.pdf
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/ronawox.pdf
    • http://dowotezovemalo.mygamesonline.org/assignment_problem_example.pdf
    • http://pigigozoruda.mypressonline.com/suvujeralugar.pdf
    • https://cdn.sqhk.co/vovewotutal/bkXgdgh/city_car_driver_2020_download_apk.pdf
    • http://viwavidif.getenjoyment.net/polyarteritis_nodosa_adalah.pdf
    • https://natedutaz.weebly.com/uploads/1/3/4/8/134850225/a1b3157ea4.pdf
    • https://lulipexo.weebly.com/uploads/1/3/5/2/135294167/5fa599a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_dfac97811e7148e889f26ac9ecea7319.pdf?index=true
    • https://uploads.strikinglycdn.com/files/77c0a356-efd1-4b88-ac13-af7156eb218b/rt-n66u_reset_to_factory_defaults.pdf
    • https://uploads.strikinglycdn.com/files/8b2ca1f6-b02e-4c64-8340-84987efb1c16/maritime_attorney_seattle.pdf
    • https://uploads.strikinglycdn.com/files/b507e8f3-a51c-485a-8566-85a8e4c5f9c7/56899962069.pdf
    • https://997b2cc2-d96d-4654-b184-8a5d7ad473c0.filesusr.com/ugd/b8d08c_64a1d118d19448acbc863dc8285a32bf.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb33.bin
a8dc79ed859024bdd97858e647c5e8f65a7b5d846758ea500d796204ed3e19ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 4868 bytes
font_01_sfnt_off0000fbc8.bin
734db83ce72027c83c19175ebfb1ad78b186e6fdf65829b965edc0f84e9f7e66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 10548 bytes
font_02_sfnt_off0001201d.bin
047f87a6abfa758c1806d4f6bafc045b3263df252f38df3befd5d620519f5458		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1201D 17672 bytes
font_03_sfnt_off00013ac6.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC6 4324 bytes

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