Malicious PDF — malware analysis report

Static analysis result for SHA-256 9146f1a235dd525e…

MALICIOUS

PDF

74.0 KB Created: 2021-09-12 22:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff050c687c4b40d9e9e964cf5c9b224d SHA-1: 57740cffadd96146a390a223e34860d44b6ff4cd SHA-256: 9146f1a235dd525ed66f73b21ea6a74461bb873e3d5398ba1d3483f0a6f6b756
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 pointing to disposable domains, a common tactic for phishing or distributing further malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically flags this behavior, suggesting the document's primary purpose is to redirect users through a network of potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://vietnaminsight.biz/ckfinder/userfiles/files/79965509030.pdf In PDF document text
    • https://vinacoma3.vn/userfiles/file/68188494457.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/dubene.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/pinekajiburibima.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/43052584355.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/xiruvi.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/75930894227.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/gaboxolenuvaxaz.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/sabidixutenujabo.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/79999143876.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/65841558307.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/jobedizabigexoboguzepik.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/d55392e18fcd7e0219f8dfdb7ed68e1d/busupej.pdfIn PDF document text
    • http://olivermilk.vn/tctt/sites/aaa/file/30630369761.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/48207293859.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/belogatina.pdfIn PDF document text
    • http://deltools.com/userfiles/file/kovategikebodinoxusux.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631208097.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/c5bm690i7m959q17db5rd44vf6/99086235757.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/82064693312.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/mipobemasajusopuwakevibo.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/gexexopikoregesidafoka.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/wirigetonoroj.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92375650837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=lego+powered+up+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_off0000bdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB4 17696 bytes
SHA-256: cdb78cbf8546ae4848e781863ed8068385618b1fc144a2363e5220b32affa8a4
font_01_sfnt_off0000eb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 10292 bytes
SHA-256: 06f4e82791c46cf16f5868c18ed2447b1678d09aefd0207ed2cf02b8e35fe8f7
font_02_sfnt_off0001026c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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