Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f2950d0df59e3d7…

MALICIOUS

PDF

86.8 KB Created: 2021-09-18 08:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4848c11df9d4862358edc81c968d6240 SHA-1: 597f2a94afbac21db12401cf6480bc2a399e72b4 SHA-256: 2f2950d0df59e3d761e610daf9584062a3093f479cd1031b8f6b50a34ee176fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to PDF files on potentially disposable domains, suggests a link farm or SEO abuse tactic. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the overall structure and heuristic firings point to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/35613250216.pdf In PDF document text
    • http://cy2hand.com/userfiles/9689621673.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/jowatomujavukusa.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/2361235842.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/ledetonosineg.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/mezafebusupojazojawiwo.pdfIn PDF document text
    • https://fasleh.net/Files/files/susanewejobafu.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/51598869698.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/10742156501.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210914_47F898C0E76685A3.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/18636613489.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/fokavadifanemafebiwobuw.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a016929cc---jetalekowebuso.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109010652309828.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/93296542623.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/pirakefamax.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/labupumerufebidazodip.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/tisidejojokazowifokegep.pdfIn PDF document text
    • https://micsys.in/userfiles/file/sevatosuxel.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/50262557802.pdfIn PDF document text
    • https://akconta.com/uploads/files/62072109183.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b17a912606---82140197205.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/22738276697.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/86088484615.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/44026331917.pdfIn PDF document text
    • http://schokozentrale.de/idata/kubevoxagexozew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+ps4+controller+appPDF 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_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 17180 bytes
SHA-256: fedff8d7ff46e558f72a21c3c32ef848c8d950b5a02e6e063577e986b9e2af84
font_01_sfnt_off00011cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13513 10568 bytes
SHA-256: 5b64db89dce711a5d2f1af5242c1044d17aaf654ee31fa9c960cd6228597671d