Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb037ee53084729…

MALICIOUS

PDF

99.2 KB Created: 2021-09-20 16:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c65db0f9fae822cadfc0a93b70caefa SHA-1: 9407540663d2d3243ffbe3edd5442ba69b24a5d7 SHA-256: edb037ee53084729aa45b12135ecac193db1e4f62af306aa41e3f6ae166a462d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm with numerous external URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links to potentially disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF format can embed JavaScript, and the presence of external links points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://krisoc.ru/uplcv?utm_term=react+native+android+emulator+debug PDF link annotation
    • http://gccde.com/downloads/blog/geust/files/disabor.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/famusebutezuri.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/87744510483.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/nadikakuvobeburukolirez.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/kutamofef.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/91043214615.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/tonatuvori.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/27212551996.pdfIn PDF document text
    • http://canoeing.by/pics/files/matexerodetu.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/35496123708.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/77144680639.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/22359887841.pdfIn PDF document text
    • http://firegallery.ru/img/upload/4000958501.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/fiwinigalomosadetetej.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a912012ad7---28966878518.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/16589039550.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142256ec1647---18272113430.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109111618445706.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/27737087765.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/rurodujufifefo.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/kupaxikozipojitelewov.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/pisejarala.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/74597683085.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/poxevobobajotiro.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/80546593208.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_off0001176f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176F 10896 bytes
SHA-256: 74c23342e92b00016f333c05f67e9afa8dc1c93cf460def33ac21def1aa8789a
font_01_sfnt_off00013071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14883 20444 bytes
SHA-256: 8b5662b8834db7dd2503bb6a67e6b2b458b4e975fe06b54fe739c3eb2c5595e9