Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5a5b2d41a07b8c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 05:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 8bc8cfca2f1deffe3df53e5a11c283f2 SHA-1: 947799ca9055cb27c10d2093c56ce0cbb1d629a0 SHA-256: 4a5a5b2d41a07b8c3a89052ae41066dcb6b669727a48f06f36012ba7f4105b96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crysiq.ru/uplcv?utm_term=i+spy+v2+apk PDF link annotation
    • http://oldmotorsclub.com/files/file/maxusalarabuvinukavexexuz.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/13371207752.pdfIn PDF document text
    • http://vizcsap.hu/files/file/mijixafexelavebesopivij.pdfIn PDF document text
    • https://bauarch.bg/files/fuxerejororirajipux.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/5277078789.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210906101955_aaps2o.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/43978072651.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/25714753449.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/remozoxunemuzesonegimavo.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/59530128723.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/sivonuro.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/norelut.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/vavepefawat.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/xejawas.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090901460954.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/23557358158.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/18226568635.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/sisefaxizuxuzuxuvotik.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/44545587286.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///87052454987.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/nakolawuragane.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/6152474932.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/27140861284.pdfIn PDF document text
    • https://kimansion.com/uploads/file/womibamabedo.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/76693042325.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/32252455375.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_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 9896 bytes
SHA-256: dda17f4f3da2737a1eb8267b7e356bc945ba2bbc340afdfcdcff4c3cbc855fda
font_01_sfnt_off0000f1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 19000 bytes
SHA-256: de8e66c63ca9cdf084643c9a44151ed0be483f5e19d6ffd610290c9358fb9bd7

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