Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae09f95b237ea2d9…

MALICIOUS

PDF

92.5 KB Created: 2021-09-10 22:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64fce67b4b7fba7551e2e851b56657b1 SHA-1: 441b30a96938badc20ec7d678fbab5ad9b09f7a6 SHA-256: ae09f95b237ea2d9d25ab02b779b83c4f64b1ad402e6dd8e760d09d473d6a735
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It 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 embedded URLs and the nature of the heuristics suggest an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.tvmreza.tv/ckfinder/userfiles/files/zotijavazafanejor.pdf In PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/54797269771.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/kovalebewutojedanokat.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/78426394003.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210905124216.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/gepufaxonoxagefepa.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab0dc6a0d---37134080499.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109031049299671.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/dejemipolotu.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/81614753586.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/gowizofu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/08c12781745ca947775daaabc42001a0/87900057534.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/81946357465.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/pinedulabe.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/febaliwevenurafuvas.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/vebezukomole.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/86540441923.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/lumesawatul.pdfIn PDF document text
    • https://digireg.at/upload/90500389004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=change+voice+google+maps+androidPDF 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_off000106ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AD 17556 bytes
SHA-256: 5a61b37bdf4934ec9c5a26969b08bba90a99254a8c8948a60f76c318e36a3ff9
font_01_sfnt_off0001340a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C21 10960 bytes
SHA-256: 4f7ff886d61b4b6477530ea878f1d80435b872d3d46ca4eefca612fc22f58366

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