Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1e292d0277f349…

MALICIOUS

PDF

72.1 KB Created: 2021-10-06 10:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01f8dbf951c7ec8f841a503738fd7565 SHA-1: 2cbe22bc38911af636b3c33cadff2d658c102cea SHA-256: 6a1e292d0277f3495ad24adf197e124596635b523e1006cebdcebe3c07301abd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious or phishing sites. The PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.gieskestukadoors.nl/ckfinder/files/files/56118272924.pdf In PDF document text
    • http://gsmontaggi.it/userfiles/files/rogaxokape.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/42909946622.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/45035406412.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/74271173093.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/76913310353.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/sikud.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/6215545611.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/mudat.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/75795121660.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/lomagawamofelomik.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/89523072491.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/jejusojepekuruwobok.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/genuletebe.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/7738544941.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/9047636829.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/31137324722.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/37621736956.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/92412266694.pdfIn PDF document text
    • https://adci.vn/data/upload/file/mezoxak.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/fulep.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/53153060412.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/18257471353.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161464c1da90d0---52181899206.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/mopuniteluwirekusime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=highcharts+tooltip+formatter+examplePDF 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_off0000b511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB511 10916 bytes
SHA-256: 710eb212fd5cb3c02b45112ae35ac9d16d09a1193e7067ef7ac469bda6b7d21e
font_01_sfnt_off0000ce5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5A 16784 bytes
SHA-256: e774fa58cdd4327df5fd8e1095a23ec94813c415530aa8fcf1b925d2e8b590e9
font_02_sfnt_off0000fa3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1