Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3993dbae856eca…

MALICIOUS

PDF

70.9 KB Created: 2021-04-07 20:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 01a5e7db4c30401379db962610d6c776 SHA-1: c8d73cc16c5d9f44f3955de3e158d46e72e88c96 SHA-256: db3993dbae856eca8da88b43131f77c269da6be163b4fe05beab8cee64f2ddab
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to disposable domains, indicative of a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns point towards a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/123?utm_term=escape+alcatraz+mod+apk+free PDF link annotation
    • http://subaxidubuju.22web.org/canon_lide_100_driver_software.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402478/normal_604d00afb71fe.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/Fggafij/hdfc_amc_assistant_manager_salary.pdfIn PDF document text
    • http://wofeboz.66ghz.com/weather_report_tomorrow_in_mysore.pdfIn PDF document text
    • http://wabiferofuvud.mygamesonline.org/65550916530.pdfIn PDF document text
    • http://zonojebiridizo.mywebcommunity.org/affective_continuance_and_normative_commitment_to_the_organization.pdfIn PDF document text
    • http://bodulotol.22web.org/78352666478.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvutose/WifECgf/recommendation_letter_template_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461761/normal_606d49fcede20.pdfIn PDF document text
    • https://cdn.sqhk.co/milujawago/f6ieAhd/80468233039.pdfIn PDF document text
    • https://cdn.sqhk.co/gipiwelabaka/ggdibhi/nice_guidelines_fetal_monitoring_during_labour.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suvowafavij.epizy.com/hemiptera_characteristics.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/hungarian_rhapsody_2_piano_sheet.pdfIn PDF document text
    • http://vosowetawevu.epizy.com/42152437538.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/gelen.pdfIn PDF document text
    • http://tipokeviti.atwebpages.com/plagiarism_checker_free_for.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/16992526111.pdfIn PDF document text
    • http://gadivedu.rf.gd/age_of_empire_free_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/kogisazefijurelebisi.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_off0000d6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A2 5372 bytes
SHA-256: b6f954914fe8de171655ddcf5c3204397307ee1db41d6a65e89f4589c3456933
font_01_sfnt_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 10476 bytes
SHA-256: e65e20da9b77c67a83061192c8819e9cde23bd01f6da7154582666dd2db3168b

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