Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d732c53d3b47bd…

MALICIOUS

PDF

70.2 KB Created: 2021-09-18 18:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16a7fb0f0e78a8447dcb63ee94f1f0a2 SHA-1: 89599ff300d294baa257444bbc10fbc347e85872 SHA-256: b1d732c53d3b47bd464b6e4526d7d6dd40289ad6e31705dbe46f5cc0e121895f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and heuristics indicate it functions as a link farm, likely directing users to phishing or malicious sites. The presence of 'SE_QR_LURE' and 'SE_CALLBACK_LURE' heuristics further suggests social engineering tactics to trick users into interacting with malicious content or services. ClamAV detection confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.taxivanclass.com/uploads/ckfinder/files/24951923134.pdf
    • http://babyindex.nl/images/uploads/53086814908.pdf
    • https://duproject.com/uploadEditor/files/nokotigoruxupedareku.pdf
    • http://xinyaoqiye.com/upload_fck/file/2021-9-17/20210917153436976886.pdf
    • https://krassimirtaskov.com/userfiles/files/lakidi.pdf
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/koxamu.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614555824c66f---6861011494.pdf
    • http://zhfangyuan.com/uploadfiles/files/11415279077.pdf
    • http://kulturazebrak.cz/userfiles/fazitonapi.pdf
    • http://ebiocell.com/uploadfile/file///2021091417145980.pdf
    • http://shesob.com/file/files/36682255728.pdf
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/luvelutujalusipivigupamub.pdf
    • http://artemon.nl/userfiles/file/xofibewenazodutil.pdf
    • https://laughteronlineuniversity.com/images/upload/files/81229128036.pdf
    • http://elma-itc.ru/!upload/files/70962326477.pdf
    • http://devveb.net/userfiles/file/28412254327.pdf
    • http://crabandclaw.com/uploads/files/17103126761.pdf
    • http://btsoft.vn/uploads/files/tasif.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/9gu8avg19ckr6tekslgp7t3vlj/biladavizip.pdf
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/zuzawunenebim.pdf
    • https://ustunbilgisayar.com/userfiles/files/90922236389.pdf
    • https://clifestyle.net/uploades/userfiles/file/dukujakikap.pdf
    • https://mannoorpally.com/uploads/file/82766621593.pdf
    • http://studiorapizza.it/userfiles/files/makiredesiluwenulejiwusas.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=fortnite+account+free+2021
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b562.bin
4e6e1f0bb776c55b481b9eddbdc50d1b2276efbdd0d0038e186e0109e99fe717		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB562 10488 bytes
font_01_sfnt_off0000cd6b.bin
61cd4f87d082e8526a81c0b7c63bb4b592b722c7041db68aac56adf9b6f225c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6B 15056 bytes
font_02_sfnt_off0000f2d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 16792 bytes

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