Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bc8fb05958a578…

MALICIOUS

PDF

79.0 KB Created: 2021-09-12 17:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e56596555369ca60ddb6b69c066c36e6 SHA-1: 9ff6aeb993de1e91b0356fe64870fac1e535a4e8 SHA-256: 28bc8fb05958a5783b1aa93db0cb702ba8a1054eeb0d1bd6587fc23c61b8bbd1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for these links, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://drafthe.ru/uplcv?utm_term=happy+birthday+saima+gif PDF link annotation
    • http://cmtoolsrental.com/user_img/files/92546519488.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/71887061236.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/28037681392.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c37aa44d7b---dulax.pdfIn PDF document text
    • https://loyd.rs/images/file/48661059017.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/olmvnsins97v97mskf3a48f740/52174223433.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/kizugaritirumajafaninabi.pdfIn PDF document text
    • http://principesgs.com/userfiles/file/40792589421.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/32502060441.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/35547980822.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/mosexoxubojokigaxasu.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/57894232222.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/sedokisuguxojilepirux.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/83500222749.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/bufamomavazarelifema.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/57163633634.pdfIn PDF document text
    • http://movediary.com/userfiles/file/13402400583.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/98808229207.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210902143723.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/10921333086.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/bezemanimepitijuz.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://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_off0000d311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 10788 bytes
SHA-256: a856385677bd72c3355625d5223411946feb6963d6c928b12abaaf108735c898
font_02_sfnt_off00010387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 18456 bytes
SHA-256: 4f687a9f4d733ff2ac1ba29316d48345cce1ef59ff684bd019739468bbec1d42

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