Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e9174aca41515ed…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 20:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6affda2c012b99fcfbecfcca093b9d0e SHA-1: 91c89027150198daffaacb153618560bae58573c SHA-256: 2e9174aca41515ed82477d656d1be4d94c0e2bcc55f5d541d44e0f0daf3449c8
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, consistent with a link farm designed to host malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's purpose is to redirect users through a network of low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crysiq.ru/uplcv?utm_term=does+iphone+7+have+qr+code+scanner PDF link annotation
    • http://www.moyekolodin.com/files/66356995239.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/88721726373.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/62741220616.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///23733083126.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/51375080803.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/94350949032.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/37271736912.pdfIn PDF document text
    • http://glassick.com/userfiles/file/kitulobare.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/51160410403.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/96976752754.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/lamawolitapolati.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210913131611.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/81858374598.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/27289988902.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/80405206227.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/domam.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/vovigobisapinimurogowo.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/62213349189.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/4564131903.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/sovipisusumanug.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/buzikigakujizubo.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/lawutezujaw.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/tigegozosugakunigawarel.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/balivuwozi.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_off0000e26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26A 17852 bytes
SHA-256: c4f09568bc3c605af2f01b937fd866074e028e5683578ea8d02e51482ddf5942
font_01_sfnt_off00011088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11088 10728 bytes
SHA-256: db81f8d604d0c85bd1c3dfa7ee30041ae7c470155efc689d704e361ed1c4cebd
font_02_sfnt_off000128fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1