Malicious PDF — malware analysis report

Static analysis result for SHA-256 36819133ece03531…

MALICIOUS

PDF

73.2 KB Created: 2021-09-20 16:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 319d6181bf37010054310619d1030c51 SHA-1: d7842be9ca7de03e8ef6330641719b0eeff157f2 SHA-256: 36819133ece03531906fa29e660098245dcc50d383119120a6051a29a3929bc8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a primary indicator of malicious activity within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=clinical+chemistry+8th+edition+pdf
    • http://ventima.ru/userfiles/file/97648171711.pdf
    • https://peisheng.org/uploads/ckfiles/files/61303de2ccadd.pdf
    • http://alibabashipping.com/userfiles/file/63318387323.pdf
    • http://terfigyelokamera.info/files/file/61731562365.pdf
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/41487539102.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/91c3c73b96f07326589b0f6358a33b2e/fajifuxurepaf.pdf
    • http://quaisetoiles.fr/img_pages/file/ruwojutusazadozoloke.pdf
    • http://gesundezellen.de/neu/userfiles/file/toxikapazosubulijanevaji.pdf
    • http://herborgthailand.com/file_media/file_image/file/52457546999.pdf
    • https://shreegroupco.com/userfiles/file/kupatisadusotaxelesuwus.pdf
    • http://technoauto.jp/js/upload/files/25887015768.pdf
    • http://oio.cn/uploadfiles/files/63542891679.pdf
    • http://apple888.vn/luutru/files/87162113405.pdf
    • http://kovovyroba-nosniky.cz/UserFiles/File/refodesekevi.pdf
    • https://kawanmto.org/contents/files/31878620838.pdf
    • http://hftyby.com/upload_fck/file/2021-9-6/20210906150056136497.pdf
    • http://files.ibiza-ferien.de/file/83026747217.pdf
    • https://daulte.com/ckfinder/userfiles/files/witujekosopuxosi.pdf
    • http://www.look4job.gr/images/_user_na/file/29316342152.pdf
    • http://abwalabamaave.com/uploads/files/niliwesikalokafujebuziv.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145727bc5af5---runoxijedononos.pdf
    • http://alhegazgroup.com/userfiles/file/jedokusokegoda.pdf
    • http://www.siphonicflowmandiri.com/upload/files/39444264196.pdf
    • http://zenkatsu.dk/files/84465415857.pdf
    • 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_off0000b9b1.bin
21a979021d0f7cbb87e9d12a48a4b7481507c441cd3333eb63b09bbd16dd2ae6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B1 11240 bytes
font_01_sfnt_off0000d3d7.bin
c039118889db7d9bc29a9ea13f0c651852e4dcc8976ec3287b4f1bdb6d7cbe83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D7 16616 bytes
font_02_sfnt_off0000fefa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFA 16792 bytes

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