Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4116633cf9bb2db…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 09:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 23cb7bbfb57de7124ce573b299cb17ae SHA-1: 7c7e2b9b659d51119b36faa50545247fbafed95d SHA-256: e4116633cf9bb2dbb9c3d942e0aa07c70f95a06cf29d6c4e73cccd2b5bfb386f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of many external links suggests a phishing or SEO manipulation tactic, potentially leading to further malicious downloads or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://ispartaorganizasyon.com/ckfinder/upload/files/tepatubofizu.pdf In PDF document text
    • http://nuuts.mn/uploads/assets/26693150034.pdfIn PDF document text
    • https://hgb.se/filer/file/surox.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/46401294640.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/gobosowazewatozos.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/guvedenaguviwovi.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109110758087328.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/69578295630.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/45469540007.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/84695665179.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/58419049496.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/63196568276.pdfIn PDF document text
    • http://www.moyekolodin.com/files/87728683374.pdfIn PDF document text
    • http://aromata.ru/upload/files/76123507437.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e97aa57661---67534716184.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/76657722240.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/dakefibawomewored.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/judijux.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/68692609159.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/41201211035.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94244377549.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/savegurepepiwixamuwox.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/68022246986.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/pikadabomigagedakipefapol.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/4177979592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=photo+editor+app+download+for+mobilePDF 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_off0000da01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA01 10824 bytes
SHA-256: b7004afb5d072feb1436a9eec6a716821c5ab615a325b1c46807d024ed0bdf56
font_01_sfnt_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 17696 bytes
SHA-256: 09c0c76d0bd82a4b5faccbb8869c7f42af08cdd7e9c135302ed382e2f4ee4520
font_02_sfnt_off00012018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1