Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b84c2a7d5451cfc…

MALICIOUS

PDF

86.7 KB Created: 2021-09-16 22:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ae335c3230b20e880dcaa04e13e5082 SHA-1: 54fc49d74f111fae192209316133ebd4718abdea SHA-256: 4b84c2a7d5451cfc1bcf76b9a110288ba8bde92803b4d925ed8e5fd1833007c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and the presence of external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://drafthe.ru/uplcv?utm_term=how+to+find+old+photos+on+my+android+phone PDF link annotation
    • https://ibshospitals.com/userfiles/file/85411557855.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/zawokaladusomunojon.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/banikosubizukanetive.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/minobewafika.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/85118692420.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/87618204199.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/42048335016.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/kamowosuwojogasune.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/31438740712.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380d810b4ad---xoketitebijol.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/boxeguvewo.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210904090413.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/31634666243.pdfIn PDF document text
    • http://maxbrio.kr/files/files/fajoxowoparofesowimuta.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/dutaxiwefufivos.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/detanofeza.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/taverukaje.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/13528291384.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/jumuminet.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/19896960893.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/belamipikof.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/nilupa.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/vipojuzakejibaden.pdfIn PDF document text
    • http://freewest.at/zelomozovejit.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_off0000eaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 18628 bytes
SHA-256: 8f2cb55c75dd66fb079622fa22e3c27ae0d9fab45d012fb10fa2b88485b45161
font_02_sfnt_off000133a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A1 10952 bytes
SHA-256: 76d66ebf977a97a73821bb1bc74a6a84111a79219a0fae0328efb870eb80e5ea

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