Malicious PDF — malware analysis report

Static analysis result for SHA-256 de53f7fee27dad51…

MALICIOUS

PDF

71.3 KB Created: 2021-09-18 10:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9bc176fc6335e17525464387e9a02c19 SHA-1: cd4c19ec7a15b5d2db0a5512c8256cc665c60345 SHA-256: de53f7fee27dad51073c5cb273478a1d7aceb79a5b1b0f674c8052e24651ec22
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm and employs a callback phishing lure, prompting users to call a number for billing or refund issues. While no scripts were directly extracted, the PDF structure and associated URLs suggest an attempt to direct users to malicious content or services, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://quangcaosms.org/media/ftp/file/38858718821.pdf In PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/66793049447.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/fopavisopamos.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/99253028089.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/rukejozigovagovoz.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/23931292417.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/logak.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/ratukugugupevejavi.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/66475472701.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210904152313.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/xuponasegolobabopupo.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/77247014243.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/wuvubudulufodofupebazes.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/50209920424.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/sebolazadomumikofalinano.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/74603104424.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zituxodajixof.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210908032959.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/rapoxifunono.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/zoton.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa7086695c---87873691510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=toon+app+pro+free+downloadPDF 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_off0000b72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72D 10180 bytes
SHA-256: 707ec682c1825c6db251b180ee0588d0b47df1b59dfa94b4a6fdfaeb7c949f19
font_01_sfnt_off0000ce1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE630 16180 bytes
SHA-256: 7837c44b596d4da128aff6ef8f5ab3296080556ecf181db70dc0716373cb8c37

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