Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd898233e8914d61…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 12:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 98bfa60e73bf17dc28662822c3b8a2b1 SHA-1: 948d6e0e5fe9e9bad3ef4b8d23ef70cb2227b11d SHA-256: fd898233e8914d61ac50d1b9fe19515c60b9573a28fb577c50c47d9b61dffbff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs point to suspicious domains, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://nomylo.ru/uplcv?utm_term=advantages+and+disadvantages+of+qualitative+interviews PDF link annotation
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/loxizan.pdfIn PDF document text
    • https://fond.ru/userfiles/file/zalibirawipujarixonewelu.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/musojawezabosapaze.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/jibosemipenevula.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/42447883604.pdfIn PDF document text
    • http://k1a.ru/images/files/file/41457348336.pdfIn PDF document text
    • http://retailcop.ca/files/vumubutimurugu.pdfIn PDF document text
    • http://electric-kernbichler.at/porogujulinigowiwesasexef.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/lotapes.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/pozegefu.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/94565335483.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/28590685081.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/xunezumitaf.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/kenosuwaresexejowakanevew.pdfIn PDF document text
    • http://opsir.eu/files/file/38585904459.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/77258920812.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/63514186981.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/desazukusaxipadofabew.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/53770527104.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/163c8036ef2919de8e61746cb3ba71d9/97749333075.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/lasujuwow.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/tuwigadafogonod.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/tugofodiluvu.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210912061542.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/26093292674.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/5658550109.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_off0000e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 17436 bytes
SHA-256: f1ac08f2ad164faaa8f8bef0615fda1f5521d113583fc2c5c67ad9d18c15aad3
font_01_sfnt_off00011065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001287c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287C 10908 bytes
SHA-256: bc03b894d794652a9457c27cf1f1ebd098531393e6f8726f7a3ca53efa4d146c