Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3214a5a25d2db9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 06:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e66ef06df655053a472978265806a9a0 SHA-1: ad068b0f86f59c80554b3c7838b830fddbd7ba4b SHA-256: 4b3214a5a25d2db98f1b3dc4ce92bae6bca51f7086421d98b4e80744c75502cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://joltiy.ru/uploads/files/wusinililidix.pdf In PDF document text
    • http://sisparts.pl/zdjecia/fck/file/79939625350.pdfIn PDF document text
    • http://tid.vn/upload/files/52261212039.pdfIn PDF document text
    • https://avenue102.com/uploads/file/32295632782.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/nasatajevulitivagi.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/579ad624e98b75b54fdabfa80ce98a00/sabenefedogibeluriwi.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/89663692780.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/32232120158.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/detofivu.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/95602720765.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/52848633948.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/lodedolapelibepisukerosaz.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/xuvav.pdfIn PDF document text
    • http://askort.pl/Upload/file/wusufutugopa.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-3/20210903103209744064.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/zolujizot.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/4918138253.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210910070353_c2iy2g.pdfIn PDF document text
    • http://innersolutions-uk.com/file/34943203103.pdfIn PDF document text
    • http://armanetti.com/images/xopawebepufikevasa.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/64228415876.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/sejire.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/kepamemifupasoli.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ij8c112eb4j7lbk7lhauh38d2t/nafufelixidagosibom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+walking+dead+season+2+mod+apk+all+episodes+unlockedPDF 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_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 11124 bytes
SHA-256: 6e35a30525b17703df531a31e768d85e451d25100c6644787366a3ae5c85ac19
font_02_sfnt_off00010bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB1 18168 bytes
SHA-256: 0737efcd544cba1304507f57773c129291a87f82b3e987419ad3bb79014677b3

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