Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff3546878a76055…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 06:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 83f0c4c8c8d9433d810563d437d686e3 SHA-1: 41e99ff17f67f252e58b3fc70ac0b8be27e639bc SHA-256: 7ff3546878a76055e6dbe273cac52b50ab1a2030280324b7b85a723b44607eff
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. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous external URLs, many of which appear to be part of link farms, further indicates a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crewmak.ru/uplcv?utm_term=warpath+apk+mod PDF link annotation
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/48947980690.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/39911241063.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/vivudu.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/8010197715.pdfIn PDF document text
    • http://hrudolf.com/userfiles/kadesudalukuliji.pdfIn PDF document text
    • https://mashura.co/userfiles/files/gemubezik.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/2835167551.pdfIn PDF document text
    • http://falconltd.pl/cache/file/joresugi.pdfIn PDF document text
    • http://www.toptehnik.si/images/74477151361.pdfIn PDF document text
    • https://securitydm.com/slicice/file/10553754280.pdfIn PDF document text
    • https://slotpt2.com/contents/files/95788605515.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/15959620120.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/kuwozuki.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/45678699450.pdfIn PDF document text
    • http://takitech.hu/userfiles/file/98848146985.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/mamavikepujori.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/kulijosapesur.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/20699667806.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/6034507804.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/42094782856.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/87149751463.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/28806905260.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/firuwumide.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/gubof.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/57930277882.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd74e2b5e7---4883610004.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_off0000d924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 18280 bytes
SHA-256: 070968924e7500432e2ab5194f7258d4a6cbe048ecf6feda6e92b762c6ace9bf
font_02_sfnt_off0001210f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210F 10200 bytes
SHA-256: bf20700623b82fc70d7c6c037a6e32cded61cbcf5a16140f2a67bad0f4dfbbe9