Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6de2d458cdc0b0…

MALICIOUS

PDF

75.4 KB Created: 2021-09-09 00:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d2f2bd36b7598c16feaa6fc261643c35 SHA-1: 91b8916abae3206f158a2236231ead903ffa4d37 SHA-256: ec6de2d458cdc0b0d6f3dedcb8f76343c793705c38aca71a2c95ad492437ae02
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to potentially disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to facilitate further compromise or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • 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 https://holocaustresearch.pl/nowy/photo/file/24095260623.pdf In PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/57932780421.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/91402091536.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/kavuvaredugunapuzenibogu.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/vavopiwofomu.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/netesojafosojibolaviwawef.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/25778288519.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/vibepagilurajada.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/nadimuverisoduterove.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/pikurunusuwisi.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/sudumazogeso.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/62255837227.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/17060201420.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210904152443_r4fawr.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/fujutiliponena.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/72289110394.pdfIn PDF document text
    • https://music-group-store.com/upload/files/31409644426.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/sibirakomituzikuzalujozu.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/rojamawifuxajexujafiw.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/56287922484.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/wudiv.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbdc31829d---tezatatesetuz.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/70063541044.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210907163239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+ppsspp+god+of+war+ghost+of+spartaPDF 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_off0000c375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 10640 bytes
SHA-256: 86ad6e0c82328800f57bf7f42d029fef7ed3319aafb7e088bf93b78f136540e8
font_02_sfnt_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 17052 bytes
SHA-256: 9a8465f1a9b243aed9632b77884e0a16901a93ddbea07be6cf4c33282ae16279