Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b241149eee1be6…

MALICIOUS

PDF

106.4 KB Created: 2021-09-18 14:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad17ed848665466e0a4beac1e6e37f8b SHA-1: 9caf068dab5529cd18cd009d8ec6a130d293dd35 SHA-256: b7b241149eee1be6f274ed5dbc3f897bf8ec816916f6c466839132b86d47d9f5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of embedded URLs and the nature of the detection suggest an attempt to redirect users to malicious sites or for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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 http://lukasikgroup.pl/Image/files/kapimeredakexukojag.pdf In PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614112df2bb09---puzufibasefowogajirakuze.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109120450274092.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/56745629225.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/wikamopozukijigela.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/rupusejox.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/tuxivasofadebuboruso.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/gaxirapabutilesifu.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/kumebe.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/68433400266.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/nimija.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/gepufubewidam.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/jofaxomizonufiwegagam.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/63884931868.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/55604363329.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161307343a1cb9---viriwas.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/51700019476.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/40430453026.pdfIn PDF document text
    • https://eurotig.ro/file/77697537128.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/turaruzokiwutovinus.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/66176809447.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/11928239089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fast+and+furious+9+hd+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_off000139c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000151dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151DD 10696 bytes
SHA-256: d7b96c6d7a2c33e54db2bab14621d66038c19eae422db25d80cb05e4b8ce9d6b
font_02_sfnt_off00016a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A52 18904 bytes
SHA-256: 68a782f0e726446c42292e92d28f9a8d3c9e59d7d0660c2f61d4208d3e1551b3