Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e37f3868e6a8da…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 15:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 59ee61f6985b49c68c967cdd57bb583a SHA-1: 4d89228ffa5e02ea45549703d3c0235415bbd8fd SHA-256: e5e37f3868e6a8dac85b29fd4523b0defdb1cc236a41694ff5b0e9ddea8ee102
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The PDF structure and numerous links suggest an attempt to direct users to malicious sites, potentially for credential harvesting or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=sankat+mochan+lyrics+english PDF link annotation
    • http://yizhu580.com/ckfinder/userfiles/files/50635236298.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/kapavajixuserakiso.pdfIn PDF document text
    • http://petrduchek.com/files/nilumu.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/19140525589.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/69153509100.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/85456525883.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/pemawerawataw.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/xanubiwiwi.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612efad1aba76---56878609877.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210905202738.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/56731955020.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/11264651917.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/18115529105.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/68827419250.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/tajuf.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141b99211a6b---belenumejewikumapem.pdfIn PDF document text
    • https://goodline.by/userfiles/file/falojapama.pdfIn PDF document text
    • https://irrisyst.eu/files/file/68966897465.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/88495934303.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/99023278689.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/66355023262.pdfIn PDF document text
    • https://clove7.com/userfiles/file/jifibudawolep.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/1661290080.pdfIn PDF document text
    • http://theponghop.com/upload/files/38268866705.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/nalerimisavajixuz.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_off0000da7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 18976 bytes
SHA-256: 832c86d474896dd3eabe931ed1cc02a23c87fd98422976db8256684e3c128621
font_02_sfnt_off000123a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A3 10960 bytes
SHA-256: 6dcce62e79d2c6b87352222e50b8f9b555be09e6367ce2149c0750e808d4874e

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