Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a98104517110e9…

MALICIOUS

PDF

83.2 KB Created: 2021-09-21 15:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ed66b8888bcf97f6f754693af28eaf6 SHA-1: 414740e276359008f21fa55661e7b088530a8e8a SHA-256: e9a98104517110e96b2fd544b0a5589ce4f1a6bb1d0049ec96dcec2ead61acbd
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to disposable domains, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and embedded URLs suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 4

  • 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://sinoscaform.com/upload/ckimg/files/202109040953349000.pdf
    • http://learningkey.org/userfiles/jekakekizawarogowokusaxa.pdf
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/purotigexoxasetitaworifa.pdf
    • http://sloplast.com/userfiles/files/86222387128.pdf
    • http://manenshop.com/upload/files/99338689715.pdf
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/3274747579.pdf
    • http://oiacreation.be/userfiles/file/vosekewu.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/bc7d5aa1bb782e0d235be2ff1fd98cb4/gimopimatoralolipataw.pdf
    • http://indigobaby.eu/upload/files/52505666671.pdf
    • https://namphuctourist.com/userfiles/file/jewinulazurutodoborarat.pdf
    • http://mfahk.com/upload/files/89352644052.pdf
    • http://songpinhao.com/userfiles/files/98246298865.pdf
    • http://ingpoggi.eu/userfiles/files/47922624087.pdf
    • http://asckhn.com/acskhn/userfiles/file/72602494731.pdf
    • http://imdmotors.com/uploadfile/file/2021090701114378.pdf
    • https://granitabrasive.ro/editor_up/zegef.pdf
    • https://iphone-odklep.si/vsebina/26365958323.pdf
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/13056957960.pdf
    • https://centrorevisionimonregalese.it/file/lirelovukasufidonuvir.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/54720469092.pdf
    • https://probidjp.com/ckfinder/userfiles/files/20210913_045658.pdf
    • http://palletgoanloi.com/img-dn/files/pamutotuzat.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=free+watch+live+cricket
    • 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_off0000e3fc.bin
b5479ec7252ba654c4134570c03c51d2bab0c581d5ef9ea67644453f8d43eff8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FC 10156 bytes
font_01_sfnt_off0000fadb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 16792 bytes
font_02_sfnt_off000112ed.bin
b85c43e47abb6837b85c0230ee6195be682e4512ff528a8ec9c8b0432d800d3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 17284 bytes

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