Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c3513f1e55331a…

MALICIOUS

PDF

85.9 KB Created: 2021-09-20 20:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: abb4e53af631d3ad43a1736c1e3628cd SHA-1: d0faf484733f2efc524152e9cbcac74665624d53 SHA-256: b4c3513f1e55331a9a23c1dd4932c9747e73e7b79ff7f475faf3abbcb41011c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document's primary purpose is to redirect users to potentially harmful external sites. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=create+a+webview+app+in+android+studio PDF link annotation
    • https://floridahouselottery.com/test/userfiles/file/kelixebonesonupiwedog.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/31493170260.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/58121345202.pdfIn PDF document text
    • http://kalikraft.com/images/file/fikunolofomagaximenoke.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/8926542965.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210914041851.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/90849114807.pdfIn PDF document text
    • http://lactopad.com/uploads/files/rinolapo.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/98860566032.pdfIn PDF document text
    • https://rais.bg/uploads/file/45644211232.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/62449265227.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/67819734795.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/30398100018.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/94316292678.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210902215157.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/41562365859.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/43ac72ed24e7c0aca62f0b5c84ec7843/baxoxedebixokixewaj.pdfIn PDF document text
    • https://olterus.net/contents/files/3703109456.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/96860604861.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/88851531420.pdfIn PDF document text
    • http://ibb-online.ru/f/file/25874882840.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/pesanatosisuzuretunebon.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/21904815847.pdfIn PDF document text
    • https://datenglagi.com/contents/files/77597391342.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/81119295961.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://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_off0000ea15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10227 18008 bytes
SHA-256: 49f82752b18e24fe9cae241fef06f7fc8690645b995a367f3e6051b525b517a5
font_02_sfnt_off00013118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13118 10760 bytes
SHA-256: 6cb149c5a66c12cbb1d3a25bdbfdeacae4936ceb84e0ef9b809c064ea4d96a0b

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