Malicious PDF — malware analysis report

Static analysis result for SHA-256 a677d13f8f2dc49a…

MALICIOUS

PDF

84.8 KB Created: 2021-09-12 03:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 948d43ed995430dc58a88a76e972996c SHA-1: 7e1fdf8375efefc97e113b5ee151301913915da0 SHA-256: a677d13f8f2dc49a86dbb701de8e330d5785b091adf0bc68dd22b8f95a43cbde
194 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and multiple external links, including one to an algorithmically-generated URL, suggesting it's designed to redirect users to malicious content. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://nbnjl.com/userfiles/files/savafaredas.pdf In PDF document text
    • https://maisonforville.be/documents/file/losirafepivuji.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/965346c67ab896e7fae50faa0831476e/73987453365.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/derilazukikapowaru.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/96957630115.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/pofirefe.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/41830483889.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/nurez.pdfIn PDF document text
    • http://falerisztika.hu/tmp/32951452163.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/21671633824.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/sepotepabovoso.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/55628584227.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/27725582513.pdfIn PDF document text
    • https://kawanmto.com/contents/files/zujilenozivem.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/28457642612.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/wikapegoguxovuvotudo.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/pekusineminuz.pdfIn PDF document text
    • https://felicityokolo.com/file/40645165535.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/fowoxepofopugisup.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/29677291417.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/63851420699.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/49862348078.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/66867396245.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/qme6pk5phucq576frja7qk1535/sexofofarapagapubikej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=i+can+do+it+meaningPDF 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_off0000eaa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C0 10348 bytes
SHA-256: 8f61dc5040fcc9d24d2f0453a31776972db18961b0909f541d8e6aeabf75e397
font_02_sfnt_off000119e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E6 17004 bytes
SHA-256: 36bed021d67271c7ff6af218e6e0962e22db9907f937341b79d7ff4dc10fc973

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