Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f963dcf3ee41667…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 10:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fdb41c3adbb18b4f83a04b35725a8844 SHA-1: b4ed1a4a4a80e6f649f8e2ffeca633f3eae365d6 SHA-256: 3f963dcf3ee41667cd4768d090130eb0f4e40f27a46cfc8f02eee5f97f1782f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The document contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristic findings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hqshop24.com/userfiles/file/79341484758.pdf In PDF document text
    • https://ww150006.linebot.net/upfile/files/20210909140321.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135294568bcb---puzitajilapizonusomubuza.pdfIn PDF document text
    • http://liily.jp/upload/file/20210906083051.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202193353466678.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/gixop.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/dipewizabu.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/53627282806.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/mujazodoro.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/xuxefokugupowomo.pdfIn PDF document text
    • https://faceless.me/userfiles/files/zoluret.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/puzokukodoxat.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/togozuxekakakimivomizip.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/zejigafukiludixuzal.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/fadikimetegunase.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/99976282054.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109061851263927.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/38325901405.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/kidiwotunugibux.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/kumedulidexufisezokegogoz.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/28845178939.pdfIn PDF document text
    • http://kunbot.com/upload/files/25752855018.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/pojevabazuzepi.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/aa0984462cb6efa76c2683f1cac0c322/73588029427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=listening+exercises+with+songs+pdfPDF 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_off0000dd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 18108 bytes
SHA-256: 52520380ad6dc5b82ddbe434a3657405095285296b8fa68dcbb2ce96c149dc07
font_01_sfnt_off00010c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 10836 bytes
SHA-256: 524a7dcd163b53cb1ad0710e6e2135b380b9b1812222c9564f7dd2c0505aac5e
font_02_sfnt_off0001250e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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