Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2799b0d8b3d339…

MALICIOUS

PDF

74.4 KB Created: 2021-04-02 19:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89914dc2e419088696c9b12bf8fafe12 SHA-1: 5e15f9c9ddf4a5bae1d40469ff3ed06c8194f3ab SHA-256: 0f2799b0d8b3d3391171b0085b185a6c5183d02ba48cb0f467b7189bfc09e7d7
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URLs and the 'link farm' heuristic suggest the document's primary purpose is to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jottigo.ru/aws?utm_term=how+to+disassemble+a+dyson+vacuum
    • http://clipshd.design/94238125361uxpeu.pdf
    • http://rubokapaj.22web.org/kodota.pdf
    • https://cdn-cms.f-static.net/uploads/4415308/normal_603b3b799a88a.pdf
    • https://cdn-cms.f-static.net/uploads/4365542/normal_601e5055c20f1.pdf
    • https://cdn-cms.f-static.net/uploads/4415077/normal_602b27a73ebb9.pdf
    • http://slimerecipe.org/23815361067fapva.pdf
    • https://cdn-cms.f-static.net/uploads/4467576/normal_5fd7baf8b2005.pdf
    • http://keepqifi.space/ars_notoria_traducido_al_espaolam36a.pdf
    • https://static.s123-cdn-static.com/uploads/4474218/normal_5fe109a6f00c3.pdf
    • https://cdn-cms.f-static.net/uploads/4367013/normal_6029274018abc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pubopunabe.rf.gd/how_much_does_a_foster_parent_get_paid_in_texas.pdf
    • https://s3.amazonaws.com/xotomisen/full_form_of_lol_in_whatsapp.pdf
    • https://s3.amazonaws.com/lukepepe/westlife_all_music_videos.pdf
    • https://s3.amazonaws.com/sazixipame/16756758852.pdf
    • https://s3.amazonaws.com/buponuwebi/39681218176.pdf
    • https://uploads.strikinglycdn.com/files/14bb765d-8b4e-4feb-b5fa-2c3ce7e1fe0b/why_wont_my_imac_keyboard_work.pdf
    • https://s3.amazonaws.com/sinadi/64051466769.pdf
    • https://uploads.strikinglycdn.com/files/0388d549-dc3a-4498-ad68-6bb4a9eb05b8/codigo_de_activacion_de_windows_7.pdf
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4fa.bin
daa0f3cf810eb87e34634c73e056a7d7efccbad9946fa8cf88969330462e5057		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FA 5344 bytes
font_01_sfnt_off0000f733.bin
701c943586528508427b2ceec6e9a95e8000c9ec93f461f9dbd642c13b9a08c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 11012 bytes

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