Malicious PDF — malware analysis report

Static analysis result for SHA-256 e96c20ca6811b477…

MALICIOUS

PDF

71.6 KB Created: 2021-09-26 20:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f0e50d997d7568d2e8b645f1ec279c0c SHA-1: 00bf0290dab987a9aaffeb17de97254175d93cb8 SHA-256: e96c20ca6811b477df0524d83fbd9bb8c3cbaeb8b1d6ec48d197b2640908504c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains and are likely part of a link farm or phishing scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, potentially as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://baaningdoi.com/file_media/file_image/file/vukojetugubenewijiranixip.pdf In PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/rolukefefewu.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/rurinewajod.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/zefakate.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/rafesolagese.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/93035178199.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/66684295636.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/nufununolixenez.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jogapikawewujar.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/fezawi.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/31725952548.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161363487333c2---26466609166.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/tolomevubadonavujogugi.pdfIn PDF document text
    • http://jawarakreasi.com/file/pufudekigovi.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/5211854895.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/31744043110.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161309b0e608c1---65530463776.pdfIn PDF document text
    • https://whitesal.com/data/images/file/6074_20210905145955.pdfIn PDF document text
    • https://tuinvandecruys.be/file/lojivumolisob.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/sodoruxadugopalezak.pdfIn PDF document text
    • https://rajaunited.com/contents/files/84978112491.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/46334225250.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/sisop.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/mujux.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/mepalesagikowagal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+fps+games+for+1gb+ram+androidPDF 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_off0000b212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB212 11040 bytes
SHA-256: a166e07987bb54d538e5eb44227911f745715cbb5569ae8da53e924d59d5e89d
font_01_sfnt_off0000cb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB67 17736 bytes
SHA-256: 8954d0402e9ae9b05be41474f2b19d8b8d8deef4c0e037a88885bff495c6f065
font_02_sfnt_off0000f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1