Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf25dcfd17bc9ea…

MALICIOUS

PDF

83.6 KB Created: 2021-09-11 00:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 63301419d4009e7652e5a19baf96930f SHA-1: 106495c5a8f62ea18537702dc5f47a6115fa9a35 SHA-256: bbf25dcfd17bc9ea5d04038392affa98cda5d3f16e01403d136e4ffd8c7e4336
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs pointing to various domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=s21+have+sd+card+slot PDF link annotation
    • https://tjpapigroup3.com/contents/files/kivaref.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/45816930610.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/68059691350.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/25396308129.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/mavoxapinizafazoj.pdfIn PDF document text
    • http://opersan.com/file/satonudati.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/bisumuxilarivoxolet.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/55254099082.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/79bfe0800f5c317505eb69c053de3446/84913560427.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/92749084578.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/78299142962.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/dojopugaranowasugoj.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/39926250777.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/robumepokizukogagop.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/fizis.pdfIn PDF document text
    • http://pi-consulting.ch/download/kokozenitunujunenukux.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/pubedelidusugunakebejid.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/67559417379.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/luwuzogobuliwadomadewej.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/42019894176.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/55428598560.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/89064978075.pdfIn PDF document text
    • https://samudra99.com/contents/files/23515919985.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_off0000e24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24A 17888 bytes
SHA-256: 11b189fff0edfb31b9dfa899ce48e21d650a3374e820afa6f8aa587138eb333d
font_01_sfnt_off0001108b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 10584 bytes
SHA-256: 4314730a348617140eb6ab97d019daf52bc1ba97fe480062ce7be516b3f74b33
font_02_sfnt_off000128fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1