Malicious PDF — malware analysis report

Static analysis result for SHA-256 55268bf7ce3fae41…

MALICIOUS

PDF

88.0 KB Created: 2021-09-15 18:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 46fdaffd4a07106777d04622d16549bc SHA-1: fd2411ab9cf54356a7a8835f523dc081d3995266 SHA-256: 55268bf7ce3fae41415ecb8016eee54ebf8de2d3e34be65b29324a0ddecb2b37
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links, likely to distribute malicious content or phish users. The embedded URLs point to suspicious domains, reinforcing the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=eyecon+caller+id+premium+apk PDF link annotation
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161356249dd2e9---44475847200.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/xubesonaporalogefu.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/cca2eed2e37a75ac5c77de1fff78b3d2/16177959033.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/xutugenakikunisal.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/3363401643.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/5434032976.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/vokanividedilojunop.pdfIn PDF document text
    • http://etnorom.hu/pictures/pisuloto.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/kezesugelut.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/punefofedi.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91339817221.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/30892800213.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/12709821159.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/56752683476.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/gefanuximose.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/97910634489.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/30748675735.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/27307140613.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/27362143230.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210912_088EB0F5AF5F9A38.pdfIn PDF document text
    • http://happy-land.hu/editor_up/busexagitomariguruworosig.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/25815517049.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/58660547508.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00013450.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13450 18508 bytes
SHA-256: 4e72111a60f9a79cd95eccd6663ff89c696e6a8b345ddd88bad8be24cb0c2d1c
font_00_sfnt_off0000d511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD511 17720 bytes
SHA-256: 7f2875f782f1a13d42a46177841ef3446490b1f5a4ee3c248828d9f19c81d51f
font_01_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 10696 bytes
SHA-256: cb49826d12f1230d3bc67e316401ae5c418b83c2a1d8c7f657a018ade6334a92
font_02_sfnt_off00011c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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