Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61e253d8bbb2e9f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 00:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e9b53255083f8e4920a90b902d7ba41 SHA-1: 1af22cd7adfefd22eb0c6735b92b58f66a48bb9d SHA-256: f61e253d8bbb2e9f74259185046180e9320a690ebbc366725c1e0b6347c6089d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The presence of embedded JavaScript and numerous external URIs, many pointing to PDF files on potentially disposable domains, suggests an attempt to distribute malware. The 'Password-protected archive handoff' heuristic indicates the document likely provides instructions to decrypt a subsequent payload, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://launensia.cz/ckfinder/userfiles/files/vedegowisolamone.pdf In PDF document text
    • http://vuoncotichdep.com/upload/files/riwutogakupiliwe.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/19352790333.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/34570905422.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/58021718781.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/wakoxunigabimemewesitir.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8080666e46d211aa7a048ed8521eba78/fakimanufejoriwo.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/70469962599.pdfIn PDF document text
    • http://thongthien.vn/upload/files/vigapa.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/93100524893.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/62261915760.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/sugumowabepizafamaloxawe.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/samipijilevenawupasojakis.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/de5d2acc8815eb769c7cdae00810b087/bekuta.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/9432503176.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/61206516443.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/dufiwudotatapela.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/xolojimelanadu.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/94854057753.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/saxegilabakabegiravi.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/jepoj.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/ralumakotuzuzorufe.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/moziki.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/wuwamoketolitunubat.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/senexozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cbr+to+pdf+converter+onlinePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 16576 bytes
SHA-256: b3ad68ab5ec61526e67ee2c32aa1da4d4ccb7ab3b8ec30631498608cdf5282cd
font_02_sfnt_off00012157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12157 10520 bytes
SHA-256: 86bf23c1ef63595dfc29c22ba8ffb650d863c47a1db7d248a2599b0f6d282f33