Malicious PDF — malware analysis report

Static analysis result for SHA-256 83309638dbd1e86e…

MALICIOUS

PDF

71.6 KB Created: 2021-02-03 02:40:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: 4200def07708d7c4c6b01a23134c0db7 SHA-1: 50aea82f61a722684b790beb21d915e03bdb2603 SHA-256: 83309638dbd1e86efeb59cb5ea2d229c08d15aa2e862285ccff8bb5cd8bfbb66
194 Risk Score

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://yafferge.ru/123?utm_term=free+classified+ads+sites+list+without+registration In PDF document text
    • https://static.s123-cdn-static.com/uploads/4501198/normal_600247862e75f.pdfIn PDF document text
    • http://leadtop.co/3280832685kj4nw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485436/normal_60076e28b9739.pdfIn PDF document text
    • https://kopaluzakiletal.weebly.com/uploads/1/3/0/7/130739322/nidopaxolimifu.pdfIn PDF document text
    • https://sezariserafuf.weebly.com/uploads/1/3/4/6/134673330/411616.pdfIn PDF document text
    • http://baltika-trans.com/how_to_combine_multiple_files_into_one_macxuf7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403805/normal_600901a99d5f8.pdfIn PDF document text
    • http://popularchoice.space/tanglefree_pigeon_decoysmzkxs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419423/normal_600aed7410bd2.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/mafodakawik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497638/normal_5feaf6087e863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_600b8f55198fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375528/normal_5fff07e7b3e26.pdfIn PDF document text
    • https://��������������������������.�����In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kesekerezox.epizy.com/36585466083.pdfIn PDF document text
    • http://tunufefenus.rf.gd/71394278721.pdfIn PDF document text
    • http://varoxekoduv.epizy.com/bpi_france_annual_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/windows_10_graphics_drivers_free.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/zebikixuvosojidu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55B 5332 bytes
SHA-256: 0d3d480627812e058d435a4efa569526ff8708dbf8f48c6e6878ea5a26220fb5
font_01_sfnt_off0000e78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 12068 bytes
SHA-256: 66455597b2babc046eeb520a06bb2552805b09d650a7e46918fd048d9b9bba7e

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