Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f09eb8fb7effdc…

MALICIOUS

PDF

83.0 KB Created: 2021-10-06 07:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bef997e2dee5231c2b685770994953ab SHA-1: 558363e6e40a6302389a0a089c4445a20dc13223 SHA-256: 87f09eb8fb7effdc8dc42e84a92d87ac07494592583e14f7f9393862f9dccd63
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, with 26 distinct hosts and 26 links, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ginzaramen.us/uploads/files/wavusuxupotupivumosujanab.pdf In PDF document text
    • https://dom-titan.rs/files/90120874943.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/99299269039.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/22000146638.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/jegogeputivinubor.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/24124748932.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rozikezil.pdfIn PDF document text
    • http://orthopediedelft.eu/files/wanaxilomuzufowezawivaxu.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/86344103880.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0366c207d587d908946ec6f1d1403682/90814235193.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/60956321574.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/34854670133.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/18438196973.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/lagatekun.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-7/20210907181006627352.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-10-3/20211003173359707053.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156a7a6e1ccc---gupevoxakiridobakogagujot.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/fapuxodilodibezizulemeni.pdfIn PDF document text
    • https://keongracun.org/contents/files/61639749511.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/33960566490.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/wurudaledapa.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/gikubamivumorasaso.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/mutipe.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/90045863585.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/luwotelirowadag.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/46136601079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=fast+and+furious+1+download+720pPDF 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_off0000da6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6A 19532 bytes
SHA-256: dd698e156e1110999dc12221ab4e35b4d2e18c9424f7fd4352bf2ac64a1e4fe3
font_01_sfnt_off00010ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCB 10868 bytes
SHA-256: 8150c6a66ec4ba20f3f7016cc2b37f402d920b3eb9ad9e91d212092bd329c7bf
font_02_sfnt_off00012626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1