Malicious PDF — malware analysis report

Static analysis result for SHA-256 97104cba9b0effff…

MALICIOUS

PDF

81.8 KB Created: 2021-02-28 08:21:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5df963322135c96f4db66dc43fb75baa SHA-1: 47626c211a2720ffb85f54751d2bb0c7f40c1532 SHA-256: 97104cba9b0effff8add21b1ce3aa6dcc3f84bd4b4dd3ca5e1132e11bb3cb3ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and a specific URL is presented as a search result for a weight loss query. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit user curiosity and direct them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/aws?utm_term=will+losing+weight+make+my+head+look+bigger PDF link annotation
    • https://goxejebifebiv.weebly.com/uploads/1/3/2/6/132682819/potemawumo.pdfIn PDF document text
    • https://derutibedevore.weebly.com/uploads/1/3/4/3/134354066/9192418.pdfIn PDF document text
    • http://biwalataluru.22web.org/weather_report_in_asansol_west_bengal.pdfIn PDF document text
    • http://idealica-italiauficiale.website/excel_data_analysis_toolpak_logistic_regressionndkur.pdfIn PDF document text
    • http://mkr-olimp.info/appendix_d_formarzn0.pdfIn PDF document text
    • https://kazubuxupopa.weebly.com/uploads/1/3/2/6/132696048/7c903aecb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jagux/sixatarajumonadawoxek.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/xukotukadisukegin.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/35718427434.pdfIn PDF document text
    • http://kedeminajuzo.epizy.com/devil_bible_in_hindi_download.pdfIn PDF document text
    • http://zebofazedixa.rf.gd/wifi_heslo_android.pdfIn PDF document text
    • http://garaben.rf.gd/pekixakodusezanixev.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/amd_adrenalin_drivers.pdfIn PDF document text
    • http://pageziwakuvagu.epizy.com/15537964227.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 5652 bytes
SHA-256: 2fcaa33ceda08fcccf38b06644fd1b268fa3e82e33b58b75d43eac4d20f0d7a5
font_01_sfnt_off0000fd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 12244 bytes
SHA-256: 5c1978085adc1128bb6c7b55be1c7ac754de3f030b3036f1a9956dbfaea034fd
font_02_sfnt_off00012499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12499 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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