Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfee93f1454cc885…

MALICIOUS

PDF

77.4 KB Created: 2021-09-11 07:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 26452c432456be2e449f99b1878e5eee SHA-1: bf83b8bbe218994d182885752282a39aeea6a759 SHA-256: bfee93f1454cc885e310921317e4b7e6e99524713dac1875600f862461624a35
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL distribution suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://khambenhxahoi115.com/images/files/lutorowudut.pdf In PDF document text
    • https://calendarsunrooms.com/userfiles/files/jusizimu.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/ropepavewasifonudiv.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/94690509.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/jisuzanosinuwujakeminu.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/kupexejasezuvajukoxal.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/65534296049.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/83197507210.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/xoxaraza.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/21844557855.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/xegesulupajaxiloxevupikol.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/44557430364.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/didowodajakirevokuki.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/41516818659.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/vutowe.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/62985340268.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/86095832151.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/3340407611.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/muzilelidejob.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/beruvixilevutetuvonag.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/toxogoxenawuzarubat.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/bavemuwupuda.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/somadu.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/43754709517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+the+next+android+osPDF 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_off0000cc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC12 17136 bytes
SHA-256: b80df08e1821a23abbcd555710857390b07298963b258882e432958b3ddeddd9
font_01_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B1 10396 bytes
SHA-256: 9e09e20abbbfe3813fbf6e23e98d93a59e2be5a2bd7a8faad2596d5e755a1bfc

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