Malicious PDF — malware analysis report

Static analysis result for SHA-256 94cbc5b8dd3b54ca…

MALICIOUS

PDF

83.5 KB Created: 2021-09-22 21:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 059c9e11085e3a3c20c171069ba17dfb SHA-1: 91207f5c14a20bb73f36413fb3a8615599628b13 SHA-256: 94cbc5b8dd3b54caf3af96ad9240cff789219d487051a529ebf96f05cd0ffd6f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous links to distinct, potentially disposable domains suggests a link farm designed to obscure the ultimate destination, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, possibly leveraging embedded JavaScript for its functionality.

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 http://dekogard.net/deko/veri/_files/76901417423.pdf In PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/81846545187.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210910192156.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/fukamaxapepekokajon.pdfIn PDF document text
    • http://hotstamping.pl/files/file/82508875657.pdfIn PDF document text
    • https://shevian.com/images/file/sakubip.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/99943402238.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/4a191691ba175475d2968666b31c6e7f/sofugigejawobun.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/jowiparesupabafox.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/28797794850.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/zabewuvimerimej.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/29032731755.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/segezapebulel.pdfIn PDF document text
    • http://gro-felix.si/uploads/62236310516.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/93123330146.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316e747c74f---lubezajabaxumidaforowega.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/jafudakuwipotinomolokijo.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/ziluvudodev.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/xubofazikag.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/fuvokubovuxaba.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210911204338.pdfIn PDF document text
    • http://mastervin.ru/files/file/78038686041.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/xenitonalif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=minix+neo+x5+android+media+playerPDF 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_off0000e000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE000 18420 bytes
SHA-256: 8a48c51083bfbe149fd39646587bf92d1af4c7645438705762611fa39257d1cd
font_01_sfnt_off00011017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11017 10632 bytes
SHA-256: 3340e3f8a8eca7396f7f3a0429a98fa7d09d2409fe368b9a83e7ac9587124075
font_02_sfnt_off00012864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1