Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a4436eefa5373f…

MALICIOUS

PDF

87.3 KB Created: 2021-09-18 06:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 91d3b05468ab21a0a77d76ef1dfcd347 SHA-1: 8b546be94858a803cc48421d5002180c1954aae9 SHA-256: f6a4436eefa5373f80babeb5fb86d72dcbe7940c31abbbd3096009a397e2d105
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing lure, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://ketchas.ru/uplcv?utm_term=how+to+view+cache+on+android PDF link annotation
    • http://orosweb.hu/ckfinder/userfiles/files/lefovimituvezisi.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/26899121570.pdfIn PDF document text
    • https://www.confirmedtour.com/files/nuzul.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/tadije.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/ratesotujudo.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/63438812500.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161397c027f2de---50786916510.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/wadiniwefadojatowi.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/kirivezagijemozopabajipos.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/losujibipisexi.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/64020811151.pdfIn PDF document text
    • https://sibirprokat.ru/ckfinder/userfiles/files/jalijemasideg.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/2912755983.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/jiwuvejodinuduzevixakagop.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/91403455329.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/mizajekivarozelif.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/jaliguzu.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/zujagibawo.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/8575091978.pdfIn PDF document text
    • https://satesayap.com/contents/files/repemukokazixetuvit.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-18/20210918073732362229.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d700d22d8f---votixuwixub.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/kalugiturogomutijugenigat.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/21456041630.pdfIn PDF document text
    • http://newshop.jp/archive/file/xedariromiwir.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/73323850500.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://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_off0000f1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 18508 bytes
SHA-256: 4d7a6c960f524241da915edf313d1df6c32ecaee33afa478ab5682e5fd172e5c
font_01_sfnt_off0001226e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226E 10396 bytes
SHA-256: 320831502fd9601edc1171609716eb067240e676aae0a7bc3ad40c196ff8e193
font_02_sfnt_off000139e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1