Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c6374d284d7350…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 11:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad486b8f11eba59565a8a458b030fd6d SHA-1: d01a3dc6feac9ccb97074b27bb6da2d29b73ffe2 SHA-256: 13c6374d284d735063a6a5221776e7db2ab50e073646e610e320d8afbf86fa98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic firings, particularly 'PDF_SEO_DISPOSABLE_LINK_FARM', suggest the document is designed to host a large number of links, likely leading to phishing sites or malware downloads. Although no scripts were extracted, the embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=household+things+that+start+with+a PDF link annotation
    • http://dongsimkindergarten.com/upload/files/koratonezozure.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210901133738.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/bijeb.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d69026855---gupovabunik.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/89829270836.pdfIn PDF document text
    • http://offerparts.com/upload/files/60618325773.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/28366547030.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/fatosuzurewe.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/mosixenesifijov.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/lelevuvuparoka.pdfIn PDF document text
    • https://sambelteri.com/contents/files/jefuro.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/turatarodirajikonomi.pdfIn PDF document text
    • https://manenshop.com/upload/files/fekuxesodamuwosetazane.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210901095617.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/65397555253.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/15857970017.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/11728669556.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/vipok.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/13710364189.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/54193179666.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/63074518334.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/82999105333.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/bivizozis.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_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 10704 bytes
SHA-256: 32385c6b45e5a7f4634c1f0bbed727fea071d29789910dc2c242e99c58837d2b
font_02_sfnt_off00010bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 17228 bytes
SHA-256: d44d1679eeb9b7e27d95445de7a737541e17c85c778105915708fc1e60bbffee

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