Malicious PDF — malware analysis report

Static analysis result for SHA-256 3abfdafb344d3e90…

MALICIOUS

PDF

67.6 KB Created: 2021-09-26 20:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f6b3edbc7268f03aea29967a1ed82b04 SHA-1: 419c26a26dbbed3a374a5614efef31864da15702 SHA-256: 3abfdafb344d3e90d73de9e65ac50124cbd324bd707040581b558d3b55554d63
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of a 'keylogger' term in one of the URLs further suggests malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://viral-list-machine.com/ckfinder/userfiles/publics/files/boxesajunuxupasimafu.pdf In PDF document text
    • http://4reality.cz/userfiles/files/11685249651.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/21163746636.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/munuled.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/52832781737.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109251638179831.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/643225799.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/2937396784.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161345f2bdfa9a---xikubutijopel.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/wiwozese.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/26314949116.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/dapotaxatukewom.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/61707056872.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/97106893298.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/jujifebone.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/37260662631.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/nawufilowefule.pdfIn PDF document text
    • http://cascad-trans.ru/files/legiseb.pdfIn PDF document text
    • http://cncsprings.com/d/files/gerelizojanakigogeri.pdfIn PDF document text
    • https://la-klamm.org/Files/files/21100087213.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/zawusewumisejofapejafak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=keylogger+hacker+appPDF 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_off0000abaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABAF 10388 bytes
SHA-256: 8a014b43f60e2f09b0156d6511963e2805c9c996da5171c81116259d0d39422a
font_01_sfnt_off0000c358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000db6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 14600 bytes
SHA-256: 0a9b92b2eef6072cdd60f14752741916e12fee7f98a689a5bd6bbc60e6f535b4

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