Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c3b9cd851435bf…

MALICIOUS

PDF

76.7 KB Created: 2021-06-01 04:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c9ce872bb12f199b8f4b26dd4db2a3bb SHA-1: 89d8a29b694023e15d6be8e7d247e50e66ab7cc5 SHA-256: 05c3b9cd851435bf4428f35a7756421bf3a275754ad6fc069236dab2e39e3ee2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with one prominent URL being https://wastran.ru/pbw?utm_term=city+hall+floor+plan+pdf, suggesting a phishing lure disguised as a floor plan. The document body is heavily obfuscated, but the presence of external links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a strong intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wastran.ru/pbw?utm_term=city+hall+floor+plan+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426063/normal_5fe50bc7b1857.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415046/normal_5fe506b5b4372.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466379/normal_5ff899a885bb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493221/normal_600996465558f.pdfIn PDF document text
    • https://zewuxufasebi.weebly.com/uploads/1/3/4/3/134320084/2ad479a2abd3087.pdfIn PDF document text
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/4565385.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425217/normal_5fcecfa132781.pdfIn PDF document text
    • https://rijemozedez.weebly.com/uploads/1/3/1/4/131407135/tipupefagema_sajidudukowusu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453532/normal_5fe6bce5a46d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pamotekegopa.pbworks.com/f/35446960709.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/w/file/fetch/144415746/free_presets_for_lightroom_pro_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4fd8347-2310-408e-ba06-8b98576eef8c/jemitogilawa.pdfIn PDF document text
    • http://zegugas.pbworks.com/f/apple_mac_pro_a1398_charger.pdfIn PDF document text
    • http://xutosop.pbworks.com/f/calculus_early_transcendentals_8th_ed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/903b2410-8438-4b83-945a-e416e64667b9/hearts_and_arrows_diamond_report.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/f/download_harvest_moon_fomt_gba_bahasa_indonesia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d86daf76-cdf3-44bf-9264-a8ccc1a264af/restaurant_operations_manager_resume.pdfIn PDF document text
    • http://dekokos.pbworks.com/f/33807703083.pdfIn PDF document text
    • http://dipoziw.pbworks.com/f/namofufivamukax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e777a98e-5f6c-4529-830f-a24a185d8992/vifurijituxuwufag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eae24c9f-ccf1-4a92-a95a-0c58ef62af03/51514764126.pdfIn PDF document text
    • http://xutosop.pbworks.com/f/matousek_-_invitation_to_discrete_mathematics_solutions.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_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 4956 bytes
SHA-256: aba30d2ac0e79c00d062619e4c4dc55a3097764b05d1b9763b9455da4a63d3cb
font_01_sfnt_off0001011c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011C 10648 bytes
SHA-256: 74dc1bfcd0063f2a4b5a4058936b64785178103ad8e6c348dd895dc4f3ddb0ae

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