Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca11f615492d08e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 09:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9b883a2b0ebb7f26cb8d13daadb1c572 SHA-1: 11ab6defc112d4f58c33d04b408541aa5d6dbf32 SHA-256: cca11f615492d08e99ab02d52e8a608a9c6130735390e867884577084ca58294
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, suggesting a link farm or redirection scheme. The presence of a `utm_term=download+lego+marvel+apk` parameter in one URL indicates a potential lure for users seeking specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://chi-kara.net/Upload/files/wibuvizezaxidaru.pdf In PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/kofotudedituresigalopa.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210917104722273483t42p16.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210917_113C446BC922D25B.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/beseloxi.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091104193473499.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/21274994951.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/wedopesomol.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/94807004262.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/19482252902.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210901142024.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/fesaxalukadajavu.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/69102957298.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/27074832929.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/51041717310.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/83388315757.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134265ce2655---lomigalufuk.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/budufuve.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/13017971758.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/77158723798.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///99915882502.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/89049833846.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/tokuweroguzozaboviden.pdfIn PDF document text
    • http://parlagame.net/calisma2/files/uploads/1800390223.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/55n8jeupg849e32mjh63sjkh9h/41809746914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+lego+marvel+apkPDF 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_off0000ccb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB6 10624 bytes
SHA-256: d96ea5413b7e2b5b1e8e72b9429031b30eb2af90bc227ca7ed7a959ff1d35b00
font_01_sfnt_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 21848 bytes
SHA-256: 94bea3f2659595103ae4b6b18f88cfc3f92a91afa9a5dd29397514cd275246c2
font_02_sfnt_off00011d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1