Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e35bd1805210d9…

MALICIOUS

PDF

83.0 KB Created: 2021-03-15 23:18:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5d39f64d09c6d451cd80c03fffc8a16c SHA-1: da64b67f575d4796a1db55edd7b6776db55153af SHA-256: 63e35bd1805210d933fc9d166ce2c64d24c71039c152a0940741897a669ccf61
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme. The document body, though partially corrupted, contains text related to search queries for lyrics and chords, indicating a lure to disguise the malicious intent. The presence of external URIs and the link farm heuristic strongly suggest the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/award?keyword=brown+eyed+girl+chords+and+lyrics+pdf PDF link annotation
    • http://jurogunufer.iblogger.org/anonymous_vpn_mod_apk.pdfIn PDF document text
    • http://ledozikatiresev.scienceontheweb.net/bovabezaruxanej.pdfIn PDF document text
    • http://ligumexijigab.getenjoyment.net/jadibopubelul.pdfIn PDF document text
    • http://merishwheelrecords.com/pulumijukovolo79osg.pdfIn PDF document text
    • http://businessoutsourcing.info/bolt_size_and_spanner_size_chartik33b.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/iigejgw/arrow_going_up_and_down.pdfIn PDF document text
    • https://cdn.sqhk.co/monubinejon/cgihgBQ/tap_tap_civilization_idle_city_building_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367277/normal_5fcabba083a42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404955/normal_60115746c391a.pdfIn PDF document text
    • https://cdn.sqhk.co/ronobiberagu/jihdcsQ/abingdon_primary_school_uniform.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/40201402000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_5fda1d5491783.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/92301258976.pdfIn PDF document text
    • http://juxeribitu.iblogger.org/48599177362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485305/normal_6018eef05052c.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/Heifgen/windows_10_lock_screen_wallpaper_real_location.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/bebop_scales_piano.pdfIn PDF document text
    • http://odemebayisitrafik.com/zinunsq5go.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_1b9a3c3bb60844a0b4ce5282d9db997b.pdf?index=trueIn PDF document text
    • http://misibinebob.epizy.com/mizeme.pdfIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_9d01c4d9ceed4867bb31e87c69a1d46f.pdf?index=trueIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_e99749011bb8411aac68ce2bc212a3e1.pdf?index=trueIn PDF document text
    • http://benogelepawes.rf.gd/ikigai_book_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 5660 bytes
SHA-256: da1fc0878332a32bcdc006a02c88baa1db756458d70d9633fbd792d880ecb5f6
font_01_sfnt_off000101f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 10788 bytes
SHA-256: 37be2c1044f7a03457076d4e9b5e983a7b7bd3a74baba7b5d02eb191539bb652
font_02_sfnt_off00012741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12741 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b