Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a4b6b5adf5c8a3…

MALICIOUS

PDF

86.0 KB Created: 2021-04-03 01:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 597c2eb5e45e6cc94751965cede9abaf SHA-1: 21bc87a78ce70c2687b42ffc668c513419ab0e5f SHA-256: b9a4b6b5adf5c8a3e491532bc40a2c2eae46661e3b62333025e4606daa5a469e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. Many of these links point to PDFs hosted on disposable or potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://golowaki.ru/award?keyword=bruchrechnen+pdf+%25C3%25BCbungen PDF link annotation
    • https://cdn.sqhk.co/rajunakeb/hnoY2pj/dynamic_parameters_in_crystal_reports.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxaxebowe/jajjghL/46164914374.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/sjgsTt3/hd_wallpapers_for_mobile_phones_free_download.pdfIn PDF document text
    • https://mumovukejepi.weebly.com/uploads/1/3/1/4/131483147/30e253d.pdfIn PDF document text
    • https://cdn.sqhk.co/tenotitur/AihT3jg/youtooz_dream_figure.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/eiijggc/don_t_starve_shipwrecked_finding_gold.pdfIn PDF document text
    • https://xasizati.weebly.com/uploads/1/3/5/9/135978204/xesaloza.pdfIn PDF document text
    • https://cdn.sqhk.co/nadizolobe/hW1Zw8P/rapodalutiv.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/44jjlPM/application_flower_care.pdfIn PDF document text
    • https://miwijefovutifim.weebly.com/uploads/1/3/5/3/135316182/6db33601b5551.pdfIn PDF document text
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/a1604ed.pdfIn PDF document text
    • https://cdn.sqhk.co/sidigodoga/ghvjdi9/mobile_speed_camera_radar_range.pdfIn PDF document text
    • http://vawurabel.mygamesonline.org/49835598509.pdfIn PDF document text
    • http://fonujameritules.getenjoyment.net/esri_arcgis_tutorial.pdfIn PDF document text
    • https://kozamewibigox.weebly.com/uploads/1/3/0/8/130874388/96f7f471dcbc658.pdfIn PDF document text
    • https://cdn.sqhk.co/gutifusuf/ic9CgeM/78160151123.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_23ad7acdd2d64b49be9144d559fe4fb5.pdf?index=trueIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_96ec5fc839f241039218b55c5a46da30.pdf?index=trueIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_3bbbc5481dcf4917b950f9b5967e83dc.pdf?index=trueIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_f81546252ae64e11ae81d7cef08fa105.pdf?index=trueIn PDF document text
    • https://64f3f273-fd79-4cea-bc15-92b2431614e2.filesusr.com/ugd/542254_06a388cb2f9c4bb6bda667d29c9bda2a.pdf?index=trueIn PDF document text
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_904d228c0d654eb0a04f610f598c6e23.pdf?index=trueIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_fdaf919952d74b198dc6dc28ea412ae3.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 5304 bytes
SHA-256: b9cd0fa7253f1572e8a2f341391f4e113680c6e7184f9bf1b54d01ed49611338
font_01_sfnt_off00010edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDF 11096 bytes
SHA-256: 076bc8b06b10716bddc856605bc1951bdf234b4d1f4e68868ae76c27e1d44725
font_02_sfnt_off000133e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E3 16060 bytes
SHA-256: 713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74

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