Malicious PDF — malware analysis report

Static analysis result for SHA-256 761305304cafd2f3…

MALICIOUS

PDF

76.3 KB Created: 2021-09-11 22:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c2cc12d7d0b41f45e84270d2f8a17865 SHA-1: b06d03ef9e25676e52e099832d9b3313148de6ed SHA-256: 761305304cafd2f3aa3f63a16591145852e193f80199a65676737f5ec30763c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct, potentially malicious domains. The presence of many unknown URLs further supports this, indicating a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kkc1.org/htdocs/cljr/data/files/jamamogon.pdf In PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613557f26cfb6---24407250390.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/97050490122.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/8791259230.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/32777546996.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/92731062609.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/92363060780.pdfIn PDF document text
    • http://lovesenergy.com/file/vejisunu.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/90168612191.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/bexagive.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/jamivovijusadulaj.pdfIn PDF document text
    • http://debten.net/UserFiles/File/sanukamopiv.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/xuzegim.pdfIn PDF document text
    • http://www.ximangsongthao.com.vn/app/webroot/uploads/files/vawotetagotulasape.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/fibijanavoverusarume.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/narobuzilewugavixomivujo.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/tunifukibigumukureji.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/pelunojop.pdfIn PDF document text
    • http://www.ezmoving.com/file/xutajemizomit.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1631163036459858261.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/529928771.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/13281514770.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/firilatalowakom.pdfIn PDF document text
    • http://posuni.com/userfiles/file/xabil.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/sanilebijofosimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fortnite+old+apkPDF 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_off0000c5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E7 18040 bytes
SHA-256: afd511a9f9ae32360c2f6080b0b2dc85a2302b93b952070d468a10e4d00afcd6
font_01_sfnt_off0000f4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 10288 bytes
SHA-256: 2b4fa0d3d096d18e76cb484a5416be8a65634528c2c26c245e996a2dc595e701
font_02_sfnt_off00010bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1