Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f61141a8937c11c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 17:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ddf24e433baa713ed6b2072c32318f55 SHA-1: 22408864673090eac0e5fe067765d6f558a09c3d SHA-256: 6f61141a8937c11cffd5a10c157550f4ee12db4a0f8b2dbabaf7e416b106129c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL distribution are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sgyscom.com/upload_fck/file/2021-9-14/20210914141419926086.pdf In PDF document text
    • http://nicolalazzarotto.com/userfiles/files/69650027654.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/16684770612.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/gubafikajorebaloka.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/pemutolarutoluwajijebut.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210913211819.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16134ccc70b442---78024819214.pdfIn PDF document text
    • https://motecx.com/images/file/33970064509.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/86189584558.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/wezatutovudajoxoxegodiwov.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/juwepugaf.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/30920977116.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/zenetoxojalujuge.pdfIn PDF document text
    • http://theponghop.com/upload/files/35212113200.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/98753058831.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/97828632823.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/fofosape.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/85483993006.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/narasomupegawonid.pdfIn PDF document text
    • https://iword.de/userfiles/file/61971935086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+watch+season+1PDF link annotation
    • 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_off0000dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 10188 bytes
SHA-256: c3db59df51cf749ecd4107f570f2af8b22ee0c7a6779bf8c0eba9369fa641d12
font_01_sfnt_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA6 16852 bytes
SHA-256: 39baea67be92e8b724313305db4c6b3587b476b6a6f9dcb8e979ceb7bd3c74ac

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