Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0cb15dc58c36d3…

MALICIOUS

PDF

75.9 KB Created: 2021-03-28 12:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 937b8051d21578a71c68281df8ddb92f SHA-1: cbddbea43e12c9207a12a8baff8b06304587e7c9 SHA-256: 6a0cb15dc58c36d31696242e29caaa808ffe4e90c048fcd19fc333081d08bfbf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/wix?keyword=juegos+de+mesa+honduras PDF link annotation
    • https://cdn.sqhk.co/tavaxikanabu/Xjghdjj/92720533416.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/wdif6ge/british_superbike_championship_2019_tickets.pdfIn PDF document text
    • http://panedapupugaxe.22web.org/jodi_picoult_handle_with_care_free_download.pdfIn PDF document text
    • http://dipugipedanam.sportsontheweb.net/nbte_curriculum_for_hnd_business_administration.pdfIn PDF document text
    • https://cdn.sqhk.co/xozirijor/fic98gi/personal_assistant_objective_resume_examples.pdfIn PDF document text
    • http://guworumitikizu.iblogger.org/tegovotatakuda.pdfIn PDF document text
    • https://cdn.sqhk.co/jikowuzu/jDhhghg/wood_carving_books_amazon.pdfIn PDF document text
    • http://lowazutax.22web.org/hindi_alphabet_video_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7e02abba-64b7-4866-936e-8bc1b1c467aa/xasoxumizemebala.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/hypertensive_crisis_treatment_guidelines_jnc_8.pdfIn PDF document text
    • https://c4647614-9ff8-4b00-b819-08dc938bd166.filesusr.com/ugd/5d3f24_d801656186b84aba808831943ac02a2b.pdf?index=trueIn PDF document text
    • http://zapusov.atwebpages.com/kamulodawiwofatutokuseno.pdfIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_4fb334aa2a714020adb121622d252ae0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20cd58f6-5451-4e32-9fe0-42add2cc81f4/20083418321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c3efaa4-22ea-41fe-b7c5-1559c08c7f97/what_are_the_factors_that_affect_school_community_relationship.pdfIn PDF document text
    • http://jeworobe.rf.gd/adobe_photoshop_online_course_free_in_urdu.pdfIn PDF document text
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_38420d01665548da909554759d20090a.pdf?index=trueIn PDF document text
    • http://wifobujaxude.epizy.com/8359171368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7415f74b-359f-4868-9bc7-12367363b6ea/wishful_drinking_film.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22857a58-cc84-43f9-a620-dfff79441425/comentario_biblico_john_macarthur_romanos.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/how_to_estimate_app_development_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/how_to_fix_epson_l360_ink_pad.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 4952 bytes
SHA-256: 05f32a4e5b4b0e4267f7ea45b6c687d92b01070f26d4774ad8f6eb73bb401dd3
font_01_sfnt_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 11420 bytes
SHA-256: 365c7ad02e88320d549786fd037e512f9fac6f18b409498a9f7b66be112db84f
font_02_sfnt_off0001145b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176