Malicious PDF — malware analysis report

Static analysis result for SHA-256 163336ac60c97e30…

MALICIOUS

PDF

76.5 KB Created: 2021-02-24 21:23:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b03633a50f3d93074c288113f55657c5 SHA-1: bb3cc4f063c9bc8be247670403f673a054468046 SHA-256: 163336ac60c97e307a51a040a8805fde36087d8d7ee8b3ac83aa18f6309b36be
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, indicates a lure related to 'Tabela de integrais e derivadas completa pdf', aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://bologen.ru/strik?utm_term=tabela+de+integrais+e+derivadas+completa+pdf PDF link annotation
    • http://vinnipoh.fun/mijugazixibaletagesuros73hi9.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/how_to_pair_photive_bluetooth_headphones.pdfIn PDF document text
    • http://jovaguduretup.22web.org/tiviboxavojorajisax.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/2519154462693pnh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_6010abbaccbb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470222/normal_5fe1c4a1bf1d4.pdfIn PDF document text
    • http://axacheat4.xyz/shark_rocket_deluxe_pro_ultralight_stick_vacuum_reviewsq8vc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475741/normal_5fe446d0f0a0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485173/normal_601e49fa7ec5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480580/normal_601751d93d055.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445749/normal_5fdd27e469c80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5fea442071abc.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/viruko.pdfIn PDF document text
    • http://onlinekartiadesi.com/31894256969k4ouo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366995/normal_5ff14aea075a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421474/normal_5ff8bb95e98e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445880/normal_6033d7f68f307.pdfIn PDF document text
    • http://osthondroz.com/zebubaxaruwibikitubejsc5d1.pdfIn PDF document text
    • http://dorodirebupekel.iblogger.org/formato_a4_es_tamao_carta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jezevenakos.myartsonline.com/34642089270.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/c_advanced_interview_questions.pdfIn PDF document text
    • http://xilekur.epizy.com/vidimudukajofezaditi.pdfIn PDF document text
    • http://gatinilub.epizy.com/sotoxejiwoboru.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/python_programming_book_in_hindi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD4 5412 bytes
SHA-256: edaa018c60d9b2e54e1f593721f8bfb639e5f09faa6af2681ecfad3c1af25016
font_01_sfnt_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 12896 bytes
SHA-256: af1b01ddfacb1e78ad67e9616608422d593dbe7788f969aa2fe8a4559b5c799d
font_02_sfnt_off00011642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11642 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

Open this report in the interactive analyzer, or submit your own file for analysis.