Malicious PDF — malware analysis report

Static analysis result for SHA-256 89cbc1be586c2325…

MALICIOUS

PDF

76.7 KB Created: 2021-02-23 19:02:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 1bc03073e2078451cd69fadd24c783fb SHA-1: 8f1a68e879fd725bcb6f15576d64fdb43ea503fc SHA-256: 89cbc1be586c2325df9cf61406175e6c929a8cddab5a8cda826524823d62fe49
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=resumen+del+libro+etica+para+amador+capitulo+4 In PDF document text
    • http://znalomstvavip.site/64844187589vdbbn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445107/normal_5fe36f923e8b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462093/normal_6028b673ddf58.pdfIn PDF document text
    • http://stopnutristrike.ru/85362268019chu46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384142/normal_60244e884e6dc.pdfIn PDF document text
    • http://wrinklestiltskin.com/617947195629cn87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458852/normal_6019270c06121.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415974/normal_5ffde1834ef36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454056/normal_60010cb5df8e9.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/R9Wjejd/bhop_cs_go.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490936/normal_6007e3e1963b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://botovomevagexe.epizy.com/prenup_contract_template_word.pdfIn PDF document text
    • http://xenupodaxamutev.rf.gd/88043789467.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/jakoko.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/75458417679.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/bazijaberakilulem.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/gba_emulator_ios_games.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_off0000eb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB19 5456 bytes
SHA-256: be580cacc080f7a030644b5e94dd6c21198474939ab839e221f72d3adef8690f
font_01_sfnt_off0000fd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD91 11912 bytes
SHA-256: 66820194502450ece7577486974acdd24332565f605c5b9c552d39fe8c4bbb1e

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