Malicious PDF — malware analysis report

Static analysis result for SHA-256 865fd83457296055…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 01:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1aeb8d789d25771c99a2833f935244bf SHA-1: 82e0b01ebfeb5c92bb4b6c16a22fc5148ba54e09 SHA-256: 865fd83457296055f0c074fe9f2e8ec0e2b6751fcd519d425e89f26703c7d32f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a large number of links pointing to various disposable domains, a common tactic for phishing or distributing malware. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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.
  • 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://thaifilmind.com/UserFiles/file/wuponaje.pdf In PDF document text
    • http://kodemari.info/data/files/9120641447.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/gadivipilesaxonejebojix.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/92985462245.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/68383580471.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/kubazajabimugutamasa.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/josilofuxu.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/1143937655.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/22165892319.pdfIn PDF document text
    • http://fkhd.cz/data/img/bekisefijapomivulatifejed.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/52103910885.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/62437669747.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/30625826267.pdfIn PDF document text
    • http://capital96.com/userfiles/file/nasuximevubi.pdfIn PDF document text
    • https://gencatakan.com/upload/file/morawudigivoke.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090120054673499.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/7ec42cd2cca15ee3407f733a8d2fa6fd/sasubudimozabitido.pdfIn PDF document text
    • https://aitalk.vn/upload/files/turuletapu.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/11583023673.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/38113750669.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/29269052742.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/19388060121.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/dipetos.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/82133010126.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/76576ce7b6b5ddc06da146b3a7088c40/zuborujinazeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=kitten+gifs+funnyPDF 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_off0000d79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 10168 bytes
SHA-256: 488fa2d458c6b9a590f9c7db2537ca1285d6107613bc3623dbe39e043bf40669
font_01_sfnt_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 18228 bytes
SHA-256: 0ddf60817b09322ab67711cf430900e7fbd67a30abd33b3d1563dd61a7c0d101
font_02_sfnt_off00011da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1