Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a3bf11fa5b31d9…

MALICIOUS

PDF

76.8 KB Created: 2021-03-21 21:16:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2a65616ae68ef6a866aab0c538f77e8c SHA-1: 167d4652b7934f69b98484649fc9e255cda4d16b SHA-256: c4a3bf11fa5b31d97c33ce0403333600fa14824a3a27cbc9161bac2a09e61313
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'midufefew.ru', which is likely used for phishing or to serve a second-stage payload. The document body, though heavily obfuscated, suggests a lure related to legal documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/award?keyword=general+warranty+deed+texas+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499673/normal_6049e6f88e927.pdfIn PDF document text
    • http://immorta-cross1.club/sigelei_fuchai_213_manualqcq91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446400/normal_5ff9072721577.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478398/normal_5ff4976e137fd.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/80093517081.pdfIn PDF document text
    • http://huaweistoreukr.xyz/archery_target_facexuls4.pdfIn PDF document text
    • http://instapodarok365.site/pm_awas_yojana_online_application_form_2018byxp1.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/nivojan.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/tarajix/5_week_pregnancy_scan_report.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/sapigovuxukefepa.pdfIn PDF document text
    • https://e72deea9-3c4d-48de-8429-d2e8e2d5d9b3.filesusr.com/ugd/68b2df_4dda04e0a66340788176e225a3ac91de.pdf?index=trueIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_4f87348f72134a0b8b8edab6d0faa956.pdf?index=trueIn PDF document text
    • https://baad1762-ad72-434c-be9a-9de7d8068d01.filesusr.com/ugd/61395f_3fec52384bf94344a0716945cffe1156.pdf?index=trueIn PDF document text
    • https://3b9c8e93-52ab-41e8-96f8-e5fc639bf6fa.filesusr.com/ugd/fe3ccd_812f7b8515c14ef28e60f198f4f5e051.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd1daf1b-0183-443e-8628-59267656cf97/kitchenaid_repair_locations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d5f9fd-2cfb-46b6-aed2-7e7979b40757/how_to_adjust_edelbrock_carb_with_manual_choke.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/88484312555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8523ea-a39b-4a90-b3bf-91ccfd7b2a94/rowirorojujites.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_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 5328 bytes
SHA-256: e389ed851f58b0d0aed64021364ed15dcd6dc1fb0527707ac2f0f8140889c68c
font_01_sfnt_off0000ffa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 11360 bytes
SHA-256: 73c66019f78b7d18241cfaa0a43b3fecdb51f15b4f82f0736b6269d00c2de22a

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