Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3d6c7c7dc68d41…

MALICIOUS

PDF

78.9 KB Created: 2021-09-14 06:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 73855672ee15b4c11696b33a2084e056 SHA-1: b18f2043444b0e3f0a0a944ad7e2f0c65b187e4c SHA-256: 7d3d6c7c7dc68d41ced387193285199b0f412838c65a3b9324f740de30675c6d
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, containing a high density of external links pointing to various domains. The presence of embedded JavaScript and the ML classifier's high confidence score indicate malicious intent. The primary goal appears to be directing users to potentially malicious external sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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://coretry.ru/uplcv?utm_term=mod+adult+apk PDF link annotation
    • http://terhautz.com/upload_files/files/79594661478.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/38011958813.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/vikiz.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/dejurobonetabugama.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/lerifisesexobexuredakuz.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/kasaf.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/41146532283.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/sopadosavavokozez.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/31786520137.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/8821902619.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/jefugol.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/vejaxosirebego.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/furasa.pdfIn PDF document text
    • https://jss-moms.si/upload/File/98917394378.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021913214719279.pdfIn PDF document text
    • http://etre-belle.su/images/file/23997391093.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d98ec3d66a5294aebaae1459a79f3edf/tavefokulexigiz.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/96544828101.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/45155961469.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/9939261104.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/64912001851.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/tevumaf.pdfIn PDF document text
    • 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_off0000d203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD203 17824 bytes
SHA-256: a1daaa544c193416c9ff9c31bb3b1d4fc833c560424dcf3525f33c675383a204
font_01_sfnt_off00010041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 9972 bytes
SHA-256: 4f9709d45b85df685477ba8328eb1345f345af6b234dbe6d659a1c292b16f842
font_02_sfnt_off0001167b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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