Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fde0b4562b2bea3…

MALICIOUS

PDF

72.9 KB Created: 2021-09-11 22:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b42ae54708fd8c32326fc6b36446bbdc SHA-1: d63c7dcb82b4ce0fdc3e659e7a2f7aceef88249c SHA-256: 0fde0b4562b2bea3f3c0ab1a880f460bf3f911b422ca0de106fb67b62e6fd824
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm hosted on numerous distinct domains, likely to obscure malicious redirects. The embedded URLs and the PDF's structure strongly suggest an attempt to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1dbf78c24709db129cbd15247e54f741/24130052337.pdf In PDF document text
    • https://ctcitsupport.com/media/files/63057555071.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/pifutapo.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/bimawupexabategipefesa.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/rurimebetunusaxin.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109081008038116.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/91629548084.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/tumuxugivemagiz.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pulinopejini.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/fimajufivezazeratolom.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/fadutanaruku.pdfIn PDF document text
    • https://blugarden.eu/file/zamozeponawe.pdfIn PDF document text
    • https://biomisszio.hu/tmp/88666591916.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/41503393098.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/51383097971.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/kojesunufuxa.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210905015631.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/wagugepudu.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/nozabavokabufa.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365be2c4d05---bozomisakemagojeb.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/gogodidamusol.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tijawejuruzeza.pdfIn PDF document text
    • http://szjg.hu/images/file/kirovokiwagulaturo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=top+hyper+casual+games+2021PDF 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_off0000b89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89D 16928 bytes
SHA-256: 2de1d31b3941beb08280237a557742fdb490495d6ebad528523a226edfbb9191
font_01_sfnt_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 10996 bytes
SHA-256: 9da0a0d9e0dc6af2cdf5730e7c91bf58e8c11d19d9a02b26a7d6703d383f4c79
font_02_sfnt_off0000fe0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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