Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b938b6739d3864…

MALICIOUS

PDF

71.5 KB Created: 2021-03-19 21:36:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 46abda199b23136c1e5d8f05a7679157 SHA-1: 25f47e4bfc932d0dcfe14c8a1caeedfb2834ba4d SHA-256: e9b938b6739d386417f29c7321e854ac8bdb45ca0ecf7e2a7c524834a71ddaa7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing campaign. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

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://maypoin.ru/123?utm_term=acr+guidelines+rheumatoid+arthritis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365636/normal_602538d351049.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456712/normal_5fdbe34eef11e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367308/normal_602d2ce4908f3.pdfIn PDF document text
    • http://sport-stavki.fun/470123485714hi3p.pdfIn PDF document text
    • https://cdn.sqhk.co/vedimofaw/VHhhhgj/66289344493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383804/normal_6019751daf54b.pdfIn PDF document text
    • https://cdn.sqhk.co/bolomadu/bh2egeX/pisipazanodurenovawiwinu.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/258heja/tuba_city_chapter_house.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495262/normal_601738f5dd157.pdfIn PDF document text
    • http://prodson.space/232306487818agny.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384480/normal_5fcf045269fb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499633/normal_6038017f00a85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402478/normal_5fcc3ce2d5f4a.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/e9Kijjb/81210392147.pdfIn PDF document text
    • http://yogist.fun/jumefawanmiuto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74d14a0-dad4-4b23-b088-e9f83ebc42db/medela_pump_in_style_vs_spectra_s1_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0768d22b-50af-4227-b75b-ca08088f757c/48107824979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f41d2513-b9d9-4f19-b01e-c7a8a5540126/how_to_purchase_stocks_in_singapore.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/45819912846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d21fb1ba-e6c0-473a-8e92-b5d538244129/nobadiwavujovivozata.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/is_chiari_malformation_related_to_spina_bifida.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_off0000dbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 5340 bytes
SHA-256: 823336cc398ca759b74d52c4505d57148126aa6e869c96325c32be22f52cde59
font_01_sfnt_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 10028 bytes
SHA-256: fb4d9b0f09d02f03c94f4d2caf9b3a6c3fa20b8e7cc18b3b9a1f509e52c66915

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