Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9516f0e70713e06…

MALICIOUS

PDF

76.7 KB Created: 2021-09-09 03:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb9bdbec7078da7f6e99bcef7e08ae47 SHA-1: c4e597bdd760ec258bc6b69445eb0c46f655d1fe SHA-256: f9516f0e70713e06d24c7198ae35290f0790bff7bdf251b520fad02ee8b701a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document, likely intended as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mumegram.com/userfiles/file/11035882831.pdf In PDF document text
    • https://cissud.it/uploads/ck_editor/files/97166935498.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/97232395845.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/zavijijatimexemiduv.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/11002199082.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c6cfdf479---82119861605.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/93935956472.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/85053758043.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/16950379951.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/berexinawesozek.pdfIn PDF document text
    • https://cmoretv.com/userfiles/40565917863.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/zirabusodiwojoseda.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/mujavesupupagugepivig.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/babebejasanetel.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/64445037518.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pifejobitozawananobezod.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109060703095776.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/9802389354.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/lufiwosilefile.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/maxujudu.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210909074436.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/43416985280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=gta+5+san+andreas+onlinePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAA 19060 bytes
SHA-256: 5fb506b9b8b63b8a19cafc85d7cc0118708f6858a6789542d652932b4dc22da1
font_01_sfnt_off0000df3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3A 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_02_sfnt_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 10416 bytes
SHA-256: 2cbd384d86b6887d685499ff37d6e915346b8344093a6d8012923b2d2bf2fd54
font_03_sfnt_off00010cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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