Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae8640cb7d47d20…

MALICIOUS

PDF

122.9 KB Created: 2021-09-09 02:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32681250393f102e1c40b67a3d932cd8 SHA-1: 58564895fa1f19671c29b4f6adf6899cbc131420 SHA-256: 5ae8640cb7d47d205d8376ddef0bf5281011c96d133ede1c4abe2686b75b9cc7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, a common tactic for phishing and malware distribution. 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 trick users into downloading further malicious content, likely through a link disguised as a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zhymwz.com/upfile/file/94464603570.pdf
    • https://mimpishio1bet.com/contents/files/72232678302.pdf
    • http://yejida.com/userfiles/file/moxatorizijofuxanekujuvo.pdf
    • http://tuderprogettazione.it/userfiles/files/41983440014.pdf
    • http://evolution-dev.com/file_media/file_image/file/12742775992.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7a90c97abb002122967df1c76bfccdeb/gitenepe.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/jazaz.pdf
    • https://beldaoyun.com/calisma2/files/uploads/49726488612.pdf
    • http://gramercy-grand.ru/files/file/62094177329.pdf
    • http://ipsgroupjjn.org/userfiles/file/318454823.pdf
    • https://auto826.com/uploads/files/25031259816.pdf
    • http://asia-test.informacittadino.net/media/files/41628418424.pdf
    • http://ecohost.ru/pics/images/file/giripupow.pdf
    • http://www.cpiequipos.com/assets/images/user_files/files/kuxugi.pdf
    • https://drticket.ir/basefile/drtiketcom/files/85523987931.pdf
    • http://techcessgroups.com/userfiles/file/xevukedoj.pdf
    • http://minhledtran.com/luutru/files/botamujami.pdf
    • http://king-pro.com/userfiles/files/zonusudisazopusexejuli.pdf
    • http://diagnosticaedilizia.com/userfiles/files/52094521396.pdf
    • http://busankid.com/webfiles/board/file///tujopor.pdf
    • https://villanakarin.com/userfiles/files/zusigilozinezesi.pdf
    • http://nct-vn.com/userfiles/file/13739026579.pdf
    • https://porfic.com/fotos/file/26426816673.pdf
    • http://lsneotek.com/ckupload/files/84580554627.pdf
    • https://inprovit.com/ckfinder/userfiles/files/83854985913.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=adb+fastboot+drivers+windows+10
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000178e2.bin
3508eac19ff4925f664dee609284a438ff30435e8a04f924371cecb6373936f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x178E2 19416 bytes
font_01_sfnt_off0001accd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACCD 16792 bytes
font_02_sfnt_off0001c4e4.bin
36a756a48474b3dd85b376fe625fe892eebbe7632846b9bd8e828ca7ee4efe9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4E4 10748 bytes

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