Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af7551c5ea5bee6…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 01:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d13a5cb1305eebe02ffa319d780ffa46 SHA-1: 6da1397c88bd3db1d9eab397360c0a49fd6324b4 SHA-256: 1af7551c5ea5bee6cea0a8b48689dc3cd923e67e797123cbdb236c4094f6314d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying the PDF as a link farm on disposable hosting, likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://coretry.ru/uplcv?utm_term=waiting+for+the+barbarians+pdf+free PDF link annotation
    • http://saluteebenesseresas.it/userfiles/files/13027080666.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/josipujabiga.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210907_D5D3B66A9E952B08.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138609cf12ef---jaxamuwu.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/guzumiraweregiwujoba.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021991533255236.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/nilako.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebbc5af7c---15655205726.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/gamavoluke.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/89419251866.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/zujaw.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/87664229462.pdfIn PDF document text
    • http://nensi.si/upload/file/37084368327.pdfIn PDF document text
    • http://hangquangauto.com/files/76329172470.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/12798611509.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/jenogiret.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/badifuje.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/17957162102.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/22073672432.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/50998897302.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_off0000d416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD416 18700 bytes
SHA-256: d15e6c597b26cecdc837d44e3364aed75edb4bdd921bbd7cb23cd7d4d3da7256
font_01_sfnt_off00010510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 10864 bytes
SHA-256: e11ecdd367fc4b1570c7097400029543a204498c77980ccb75b4d15f43f6f762
font_02_sfnt_off00011db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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