Malicious PDF — malware analysis report

Static analysis result for SHA-256 83696cee83f92a0c…

MALICIOUS

PDF

79.3 KB Created: 2021-09-19 15:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 47386a385d982cb32f5f284ceeab473a SHA-1: a7d7497541d4e16ce532f7a08184af17ea252ac6 SHA-256: 83696cee83f92a0c5b27a31035214f86935bd48c87e5876a06b0be9c831de209
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a strategy of using many links on disposable hosting, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://pistant.ru/uplcv?utm_term=what+does+a+shield+do+in+minecraft PDF link annotation
    • http://marleenjansen.nl/images/uploadfiles/jigusoximovolijotikofigox.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/93443115582.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/videtuzevalelenas.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/62738946589.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/7635990695.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/leroxivej.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/94249113227.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/78723688399.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/27755423941.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/80667342636.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/mimudenizavat.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/kokiberufeb.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/79893996319.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/walapevutezufobog.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/64574824764.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/radonijozikigiwevewowam.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/5979399960.pdfIn PDF document text
    • https://mcsfood.com/images/file/87790840847.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce1ed2f72b---7081669020.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/1737870491.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/zexozovimojugozawalivezul.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210910185257538.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/43059271393.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/lafigazigulibaliwug.pdfIn PDF document text
    • https://telorgabus.com/contents/files/24495550221.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_off0000d37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37D 10732 bytes
SHA-256: 98b978c711e74f053f94720b062c9cfb92816d720a59011a51bbe084239ea694
font_01_sfnt_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 16952 bytes
SHA-256: 2ecc4060c16d14bf6bd789df8721b72659eb3b5399f34f2b016c7da394ada3c4