Malicious PDF — malware analysis report

Static analysis result for SHA-256 c894a736e9c3132c…

MALICIOUS

PDF

70.7 KB Created: 2021-10-01 13:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 17b1c15396a822be4ac6c5f08b90f7a1 SHA-1: 1a66a014e353b2f535c9f0ef6cb05ce2ddd07e57 SHA-256: c894a736e9c3132c4f43f57394fe5b9f92cb2db98f10db02057dccdf342cd627
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to redirect users. One heuristic specifically identified a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's intended to lead users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://dptour.net/bot/ckfinder/uf/files/ledifiwox.pdf In PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/kubesutibufogiremajabe.pdfIn PDF document text
    • http://santeh.md/img/files/lowokotaraxivufoga.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/tizepukiwujupalux.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/19405027188.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/72416981192.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/55305445664.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/614851ea068e6.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/7883453486.pdfIn PDF document text
    • https://susta.vn/userfiles/file/6573125341.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/73266114649.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/fibegirexejarufurawerufu.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/44580088031.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9a9ecd655cd764e6d5cec5428de2cff9/sokele.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/33016109220.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/96165670265.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/86476638349.pdfIn PDF document text
    • http://sswjeans.com/files/89659752985.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/82753904396.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/36916879864.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/koxaded.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=google+play+pc+download+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEB 18372 bytes
SHA-256: e6611a4a1fb6774b04edc6dad513dbad1f623aa88b3864bb656478cd43607ee3
font_01_sfnt_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 10560 bytes
SHA-256: e85ae8ccf18035c46e09389c1684de52a84c18762aa5c5e7bc8d2ca1a2cf631d
font_02_sfnt_off0000f556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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