Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc33ba6fe6b2acea…

MALICIOUS

PDF

86.4 KB Created: 2021-09-10 08:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: edb277d15be6a7838008e360a2e18898 SHA-1: 649011fa381cdb154b7123efc41dbe1c201ec126 SHA-256: fc33ba6fe6b2acea6be6b7f470c8890ae248c31b1326b7d8394f0f86cbc29435
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/uplcv?utm_term=60+fps+fortnite+mobile+android PDF link annotation
    • https://n-zvuk.ru/upload/file/53028215008.pdfIn PDF document text
    • https://onlinendttraining.net/files/57628493661.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/30083728872.pdfIn PDF document text
    • https://edarky.net/data/file/64672709150.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/tabomemajera.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/88851748187.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/77921815556.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/13958124330.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/3065217291.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/47713309489.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/18637563860.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/90584994748.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/31024319131.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3de521252af088c037e37cb69c69ebf4/92890781744.pdfIn PDF document text
    • http://1carl.com/userfiles/file/29431514496.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/wifomibi.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/vagugunijifutileb.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/60362164082.pdfIn PDF document text
    • https://allianztc.ro/files/file/zerazofibaduselemeturovo.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/dotoduvigafavu.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/korobef.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/32783116100.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303319e5518---83774822367.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/lolulabibogolij.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/70778681683.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_off0000e680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 19652 bytes
SHA-256: 4924a15fc82df5d16e804ed009f3307128ec1ceaa68209bb416837a61f58ab31
font_01_sfnt_off00011a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6F 10992 bytes
SHA-256: 65ad2bf724f8497086e45e5e441bf6413c41166e7df3ebbebea1846b62fb058d
font_02_sfnt_off000133b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1