Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99dd7e499a3940b…

MALICIOUS

PDF

76.5 KB Created: 2021-03-15 22:30:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 664c17b0da4897463744587fd9e21cdb SHA-1: d5274aa646348123c745a3dc02e31414fb371fc6 SHA-256: d99dd7e499a3940b2208b85e074940951b1c8c1126f91c6303ad3af9e0d1463a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=how+to+format+an+essay+for+a+scholarship PDF link annotation
    • http://procripton.com/89851738991z93me.pdfIn PDF document text
    • http://prognoz-football.club/kumidovimiwerunuxr6jz7.pdfIn PDF document text
    • https://wironutoti.weebly.com/uploads/1/3/0/7/130739747/taguroni.pdfIn PDF document text
    • https://vavaterojitenoj.weebly.com/uploads/1/3/4/8/134898986/4412062.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385009/normal_6009787d78d1a.pdfIn PDF document text
    • http://checkmycredit.info/bose_qc15_microphone_not_workingiyrz7.pdfIn PDF document text
    • https://fepazizagi.weebly.com/uploads/1/3/5/3/135345318/1113f1c6edbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470540/normal_600608189ac2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498893/normal_5fc9c37a8516b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5ffdff0c612c0.pdfIn PDF document text
    • http://nomuvafemokin.iblogger.org/21796904144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416322/normal_602731252e56b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zivumimilalak.rf.gd/dodge_dakota_repair_manual_free_download.pdfIn PDF document text
    • http://godakumezaguf.rf.gd/supac_guidelines_fda_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65bd3d4f-fbff-488e-842d-b592b75d5cea/8513175559.pdfIn PDF document text
    • http://kesekerezox.epizy.com/blending_words_kindergarten_worksheets.pdfIn PDF document text
    • http://xoxexanizeb.epizy.com/innova_3030rs_reviews.pdfIn PDF document text
    • http://tudozujuxijoz.rf.gd/66470546064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57a657c7-839b-45d6-ad19-6069eeb441f1/sony_bravia_32_kdl32w660e_full_hd_smart_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e586f971-55fa-4bbe-846b-becd02c2c4d4/best_mini_stereo_system_2020.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_off0000edb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 5408 bytes
SHA-256: 8cbcfaaeaa4c6b46255c28359f52d772e4afe6d8d0df19c71eb4b3f3c120a921
font_01_sfnt_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 10804 bytes
SHA-256: e4f9181339aee1c7f0a8b62704a36250862b4d72233dd7c42159922444cd22b2

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