Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8692a83a4026a5…

MALICIOUS

PDF

82.8 KB Created: 2021-09-09 01:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f2b0acf50b397ff9ee654b0983dc6d7a SHA-1: 9a8ad7c06fb6e0d268269a7cb46cf2f7fc553491 SHA-256: 5a8692a83a4026a54cccbea661640ce1dca7a4cff07ee0cbc4b0bcb76aec2f36
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest the document's primary purpose is to redirect users to a network of potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

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.
  • 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://www.petersonassoc.com/emailimages/file/wujiretoledenop.pdf In PDF document text
    • http://kavernoklub.com/campannas/file/mujuwe.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/bonajoziwenobipakimu.pdfIn PDF document text
    • https://sapporopools.com/contents/files/2835522379.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/memeworowafezunemiluz.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/72368293956.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/xezelesolonagifip.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/24391305509.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/dixab.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/gosovotowepejuzadu.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/43406273555.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/4935254138.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/wabukupalidozoditugixem.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/11065461101.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/16223243493.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/nifofizojanesegesodabul.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/57294314090.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/wamepefunuvegozamate.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/davijeded.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/zugufolo.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/vi4395hbpcesi5f634ci5h4tuf/zuviliju.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/79414948960.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/muluvedujijidovesu.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/damunorevokuw.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613081b2247cd---21178117427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mxq+pro+4k+rk322x+firmwarePDF 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_off0000db08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 19020 bytes
SHA-256: a4b7e8e02502b9bd5e94b87dae23b7b24f151a9c338adb5ff6368091223b9d50
font_01_sfnt_off00010bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB6 10892 bytes
SHA-256: 6760e922d1543c8e3cd19d254d8e15e23ae698f4bffe62155b36abeccd685037
font_02_sfnt_off00012519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1