Malicious PDF — malware analysis report

Static analysis result for SHA-256 48591c0e3ff7ea6f…

MALICIOUS

PDF

70.9 KB Created: 2021-03-20 00:17:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c7c4de6d7f7ebc9238f11f26b5cbafa4 SHA-1: c3da65e09e2337bdc15a51a57e8dcdf253b1745d SHA-256: 48591c0e3ff7ea6fe33c110617db35e7aaedfa90f2a691b20383dd07bbd9db4d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are characteristic of a link farm used to obscure the final destination, likely a phishing page or a download server.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://baarspo.ru/award?keyword=lalat+buah+bactrocera+dorsalis+pdf PDF link annotation
    • http://nonoxutiwi.mypressonline.com/critical_capabilities_for_business_intelligence_and_analytics_platforms.pdfIn PDF document text
    • http://pexukakadom.22web.org/17437671215.pdfIn PDF document text
    • http://smotrikino.fun/audio_driver_for_windows_xp_2002_service_pack_3_free_downloads6z5h.pdfIn PDF document text
    • http://fbcopyright-center.com/iceberg_lettuce_planting_guide7efv8.pdfIn PDF document text
    • http://weinmvc.net/nunomewekimagubixopejipti27.pdfIn PDF document text
    • http://bevibopo.22web.org/irs_grantor_trust_reporting_requirements.pdfIn PDF document text
    • http://mon-cmbretagne.com/job_description_of_restaurant_general_manageroc91r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425728/normal_6031843cc371b.pdfIn PDF document text
    • http://mesretly.xyz/warhammer_40k_kill_team_elitescanxs.pdfIn PDF document text
    • http://misstourist.info/xforce_keygen_autocad_2013_windows_10859i4.pdfIn PDF document text
    • http://aycotoro0.xyz/86177002954iwzh1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_5fd340e3be690.pdfIn PDF document text
    • http://remoliwagofaju.mywebcommunity.org/altair_hyperworks_tutorials.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/52690286243.pdfIn PDF document text
    • http://tejusadesivuti.epizy.com/sebafufifabofapiwex.pdfIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/88687734815.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/how_to_get_emergency_doctors_appointment.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/buzafogubitox.pdfIn PDF document text
    • http://xupudajiwozov.epizy.com/vafalefuliwasovidotes.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/jidavepuxutexiludetuda.pdfIn PDF document text
    • http://duguzikazom.rf.gd/jixiji.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73A 5324 bytes
SHA-256: e64c4b5d34089cf49ae601243b641d1777be03faa648c09ff22e7c8d8b0e9974
font_01_sfnt_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 10752 bytes
SHA-256: 1ac13b6dde093362e6b31dc91452a21c9dc9fde19e9957665429b355fc70c8c2

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