Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9d275403bf1db0…

MALICIOUS

PDF

71.8 KB Created: 2021-10-01 04:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9cd7e56054b0d76d44dfac10bdc805b1 SHA-1: 8fb3a53efc0ba9248feea8663530df424ea612e0 SHA-256: 1c9d275403bf1db0a9635cf3533ccfa2c64b467b0da2963a94240a4b209cfb5b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many of which are hosted on disposable domains and appear to form a link farm, a common tactic for phishing or distributing further malware. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest this document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=minecraft+pe+servers+to+join PDF link annotation
    • https://baigiangtoanhoc.com/upload/files/dokusow.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/219796189.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109041116139413.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/luzizuzadivinevevamokeg.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/49485519071.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/12798623718.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/46379582313.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/lufav.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/1091922021.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/5176529338.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/xanilixakozamonezuwenin.pdfIn PDF document text
    • https://angkalaris.com/contents/files/panozojosilanomam.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/nubunuvovava.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/nejumav.pdfIn PDF document text
    • http://ipllaser.in/uploads/vitut.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/88892654768.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/30738474447.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/xesojotewimadavaji.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/4830466467.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376a1182d9f---zulab.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/dubinosaxege.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/9dv7le0aim35avv46v0h8bi66v/69479812883.pdfIn PDF document text
    • http://intertribo.sk/files/lezubusib.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/monefi.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_off0000b3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E1 17808 bytes
SHA-256: 43d76cce81a76ac2beeb48fb22588453f597f3cad62a588ea177c5b9d33b0512
font_01_sfnt_off0000e112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 10616 bytes
SHA-256: f7eb40ea400cc076cb496cb4cf29430fb80a972729b6c16eb962e9c6f19c33b8