Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41e5c3f9b0e717a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 16:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d2b283d492002031e99e7fe19d73430 SHA-1: 5d0a527cd67164aa7b7d2abb054008ad58484f89 SHA-256: f41e5c3f9b0e717ad8c2ace91a6ee5f07f74bf9c6c4b3ed2f5bc4512b5b58215
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious content, and heuristic analysis indicates it is a link farm on disposable hosting. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://dallapietamarchisio.it/userfiles/files/63663680328.pdf In PDF document text
    • http://theclelandgroup.com/img/upload/file/dumudiju.pdfIn PDF document text
    • http://gaudi.tw/upload/file/jewozusidifan.pdfIn PDF document text
    • http://youil.org/userData/board/file/12660684929.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/57364028270.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/fifitebapulonatizelure.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/4154963618.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631723818.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/55388533543.pdfIn PDF document text
    • http://insei.eu/userfiles/files/fewomuvutakepatugoba.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/watixevuguxajonedebiki.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/29966688365.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/forosupopipe.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/23348712488.pdfIn PDF document text
    • http://signauction.net/userfiles/file/ruwuxop.pdfIn PDF document text
    • http://soles2walk.cz/data/file/tivanexewomukukodexon.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/xevutemezediziwidemokewa.pdfIn PDF document text
    • https://phunhai.net/upload/files/30099546872.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210912_1F897D57293D2EFD.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140be003d54a---11139149577.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/fowurigesubidajuk.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/worez.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/2408850130.pdfIn PDF document text
    • http://farmina.ru/uploads/files/todozedolezaxedalev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ocean+is+home+island+life+simulator+mod+apkPDF link annotation
    • 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_off0000d306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD306 18288 bytes
SHA-256: f8eac8eef7e43f8139e8bc441fd7990e97db147099770641f69f412d0ca48c0a
font_01_sfnt_off0001028e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028E 11104 bytes
SHA-256: 4a75091146d26899032aa7e54979fd7d206fae7ce7aa0f6bea98c4b66a9659b7
font_02_sfnt_off00011c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1