Malicious PDF — malware analysis report

Static analysis result for SHA-256 31770b721663d3ae…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 21:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff2f9eca8367c5006595c93fa29f9ec3 SHA-1: 7129d07fa1d8db0f341192ab76bfd56769432035 SHA-256: 31770b721663d3aeb03533a60859b195a5a7d57320a322cee9f7caa3cf52d3b8
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on various domains. The primary purpose appears to be to obscure the ultimate destination of malicious links or to host a large number of phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://technology-mp.it/userfiles/files/3941775992.pdf In PDF document text
    • http://zatuchlina.cz/upload/file/12170862014.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/13885417605.pdfIn PDF document text
    • http://midospa.com/upload/files/zaduxujudi.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/19270461206.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb072a2756---24734313934.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/48243301030.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/walubabejazesezirap.pdfIn PDF document text
    • https://questyme.com/userfiles/file/rimisuvowegu.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/68982533767.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/98394533791.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/gezodoxuboxofiduraxoxud.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/sigaravetotejapivixutel.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/4875622827.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/37818588237.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613075c08a92f---43442270607.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/65851587345.pdfIn PDF document text
    • http://electric-kernbichler.at/sawikixusubetowarez.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/89669233316.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/74076126355.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/34161644215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+mandalorian+ar+appPDF 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_off0000d3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 10356 bytes
SHA-256: a80c0a9c1a6dd0eb761ad67fdd030220b48d01d3116afb4c5877ef7baa2c7a41
font_02_sfnt_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 18548 bytes
SHA-256: e3fffcff872990e107a3ae03ccf92458bbc581477645cb84f44b7fcbf748ffe8

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