Malicious PDF — malware analysis report

Static analysis result for SHA-256 34fc215403407503…

MALICIOUS

PDF

73.0 KB Created: 2021-09-12 06:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 39734b673ee072f296b354c128940cca SHA-1: 27bc42acbc297d30100c20111596da3cd2164cfe SHA-256: 34fc21540340750366b3a69c34cdbb656ffe23869fd2123d820ce4bdf323da6a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the use of disposable hosting for these links. While no scripts were explicitly extracted, the nature of PDF malware often involves JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://icmasistemas.com/userfiles/files/41044305416.pdf In PDF document text
    • http://littlepearlbooks.in/data/eimages/file/tizamamewivowizu.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/zawilipelikekamox.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/tuwokiroribotazuxitigixop.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/41994198788.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109011937228715.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/80610598828.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/44054739714.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///79529072049.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/vekowokibamoxuwuxi.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/rugalagudotikuxadokotux.pdfIn PDF document text
    • https://blugarden.eu/file/sotinumelot.pdfIn PDF document text
    • http://kes.org/upload/editor/files/14984556789.pdfIn PDF document text
    • http://skncn.com/u/files/8378943346.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/karivujaja.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/5727754303.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/23302823916.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/naxukelutakejunabitez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=gangstar+4+mod+apkPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE4 16240 bytes
SHA-256: 3f0ffeb8dd1d8b83a153761fbffb4649c2885dafef462c870d79f5dc597fc307
font_01_sfnt_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 10672 bytes
SHA-256: f1630e5aac3be9d6141fcf9000f74d26f3b541ef7e76eeb731040fd09a1f4b4f
font_02_sfnt_off0000feaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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