Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c15ac700c13c65e…

MALICIOUS

PDF

66.1 KB Created: 2021-09-26 01:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4f624b1f956c3d9ef967d20c19b71dbe SHA-1: 98cc799cc736f44024a158744e17f70934ce5ea3 SHA-256: 9c15ac700c13c65e374dc39e2a3e5f257fdc61bcdfd1cf56035aa66b9627315d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely involving a JavaScript exploit or a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mlbcsimleague.com/ckfinder/userfiles/files/sirororupejodeboludo.pdf In PDF document text
    • http://fashioneducation.ru/userfiles/file/sineje.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/81861132162.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/92851173639.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/87236510707.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2c7190fc91a15e736f6dd62f0d6cb73e/powanobesejujufigisom.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/42027729582.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/gelovirugafu.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210906110729.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/1856430458.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/72873232562.pdfIn PDF document text
    • https://expomediainc.com/upload/file/3759972162.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/66391423936.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/tojelefim.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/91040551627.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/9367294384.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/98336762676.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/toxolagororiw.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/45302521003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=all+io+gamesPDF 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_off0000a829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC040 10128 bytes
SHA-256: 4228d9762f5ae56484973f83498dc207cc08027da570f036fcf0b75238378f58
font_02_sfnt_off0000d6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 14748 bytes
SHA-256: d2626ea0b3ad4eed0b370a846f45bb7f459617804459c7d4764bf0d5faf70faf

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