Malicious PDF — malware analysis report

Static analysis result for SHA-256 9312d13033a24ac8…

MALICIOUS

PDF

80.1 KB Created: 2021-09-23 16:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cdf21d56cc64ee882c058f150346d48d SHA-1: 9a3819f5050dfa50ba6ad8016a460f9e00a77e62 SHA-256: 9312d13033a24ac809c0644d6df7b56695a4861c5a496b4ca7f2c3dfbca1765f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://younewstoday.com/task/userimages/file/30590048965.pdf In PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/17076157541.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/87656727097.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/28458043072.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614726f2234cf---doput.pdfIn PDF document text
    • http://ipllaser.in/uploads/nebudezurotogogititobi.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///62480554429.pdfIn PDF document text
    • http://htcable.cn/d/files/zotemexijogigafemesu.pdfIn PDF document text
    • http://cartopack.be/Images/file/51933566362.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/tepurawaragawupapiki.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/piluvigudexamaruwenakadom.pdfIn PDF document text
    • http://ttc-investco.com/img/files/45238265076.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/81191646032.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/61242700446.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/tadelovejibelokuwezolubu.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/wirogipojapaxupurawod.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/37282081272.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/15356926847.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/52269726101.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/lno4s7jldgib7c9duda5vjcn83/widirovujo.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/58504053632.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/19345028059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=free+renown+codesPDF 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_off0000d685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD685 10028 bytes
SHA-256: 27d9efb90ca4b9f67ed76c1cece5b8df3e8684449f547e880151ab615204ecb8
font_01_sfnt_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 17708 bytes
SHA-256: 2c9ee5a28bdc00f1e70d948c070eaf8a67b3c04957b4982d3519d0d4feae0412
font_02_sfnt_off00011b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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