Malicious PDF — malware analysis report

Static analysis result for SHA-256 01bc430e58d58eb1…

MALICIOUS

PDF

77.5 KB Created: 2021-10-16 09:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a9e7578949c8b13ee3784392ee5f2be9 SHA-1: 70a855122f4d1bac5a269f608d7acfefa428682e SHA-256: 01bc430e58d58eb1b70eb8d24654c684a056e665e68a5f15f71aaa172c568ba3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings indicate the presence of external URIs and a link farm, suggesting the PDF is designed to redirect users to potentially harmful sites. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://rsport.eu/yonexshop/static/file/51946838816.pdf In PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/sebepimutagemakepip.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/69240399349.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/fofizoduxalekaru.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/raxulogutigufosa.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/86284565667.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/49233374679.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/79349639716.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/jagemubosalo.pdfIn PDF document text
    • https://codefon2.solar-napkollektor.hu/js/ckfinder/userfiles/files/25225984831.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/40217730472.pdfIn PDF document text
    • http://creationart.hu/files/file/petatefulafatavab.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109090129322055.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/724add55d9ba70890b1102c6b09e53ad/67630701175.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/tuwofolavofi.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/51432200600.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/purabaxudi.pdfIn PDF document text
    • http://brlairport.com/images/file/zirufugakuw.pdfIn PDF document text
    • https://aokman-drive.com/d/files/45668190851.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/xosivodopetaveruzomaje.pdfIn PDF document text
    • http://sga.cc/uploadfile/file///2021092609041151.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/29210200156.pdfIn PDF document text
    • http://archbot.pl/files/file/masuwo.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/zusisijemalofababonip.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210911074702.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/29345887123.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/1hHberoKktI/uplcv?utm_term=average+comlex+level+1+score+by+specialtyPDF 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_off0000c7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DB 11068 bytes
SHA-256: 170c61daf1e04f236877dfaa947a2e3691aae4a0607ed6168416fb3a5743af88
font_01_sfnt_off0000e198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AA 17908 bytes
SHA-256: 2ae43b55bf1edb75eb6933d4ba2f961d8dd7220ba1e29c1e7bcbc54d8796e3dc