Malicious PDF — malware analysis report

Static analysis result for SHA-256 251167638e33599b…

MALICIOUS

PDF

77.2 KB Created: 2021-09-10 00:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ba74807fae187294a105938db254a11 SHA-1: 3739973de99baa471623fe01b3c4e58aee13cd84 SHA-256: 251167638e33599b65d03e2c698f6e7fd478436be15ec3006e035ed7df547469
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely used as a lure to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://soechi.net/userfiles/file/85223349659.pdf In PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/69661951425.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210903231402.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/duvasofemibedoroximenela.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/meragizil.pdfIn PDF document text
    • http://odumakus.com/uploads/files/20873413042.pdfIn PDF document text
    • https://value.ae/userfiles/file/jumasumetaza.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/zaxaripotezulekanumokasap.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/jopemuriza.pdfIn PDF document text
    • https://curvy.tw/upload/files/kenofijujalulabimawizidew.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/22882808783.pdfIn PDF document text
    • http://sksound.com/userfiles/file/23216258506.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cbd9a57b2---93238437325.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/zolojafovulidisazififid.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/kujuzofag.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/19760893979.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/petirepolex.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/47879729413.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210909_121402.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/ladabeju.pdfIn PDF document text
    • http://oilspecchem.com/files/livawimivinorifixipobi.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/6934437000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=chor+machaye+shor+old+moviePDF 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_off0000c7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C2 17988 bytes
SHA-256: 927cd59936aceff854e0d5cd3151b19c0dfd17355a8034f33c72423049d141b4
font_01_sfnt_off0000f6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 10644 bytes
SHA-256: 46a6698bde40b618298e82ef87d3660ee9eab4f6a3e3ff74507bf86f568c9d7f
font_02_sfnt_off00010f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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