Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb136b931ddfd691…

MALICIOUS

PDF

73.0 KB Created: 2021-02-20 18:19:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f93d9c962fe8e4463af1c8312f078210 SHA-1: 8ec6393bf01190763ec08c146638136a517aa32c SHA-256: cb136b931ddfd6914eba271347c1ea34ff5c488c183ac62a9d4506296a7ac2ed
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/123?utm_term=hornady+z+max+223+reloading+data In PDF document text
    • http://ribuvesigofozeg.22web.org/55459711645.pdfIn PDF document text
    • https://cdn.sqhk.co/tovisegag/geifhht/52426211302.pdfIn PDF document text
    • https://cdn.sqhk.co/guposidum/8KhiieD/99196150115.pdfIn PDF document text
    • https://nabokopawupanav.weebly.com/uploads/1/3/0/7/130739772/2319646.pdfIn PDF document text
    • https://sitasujo.weebly.com/uploads/1/3/4/8/134876827/0be56.pdfIn PDF document text
    • https://sojurepew.weebly.com/uploads/1/3/5/9/135992925/3195454.pdfIn PDF document text
    • https://cdn.sqhk.co/segenapiza/fgdgdPP/pixitracker_major_87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370051/normal_602623782b254.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://warepeg.rf.gd/ssh_secure_shell_for_windows_10.pdfIn PDF document text
    • http://niwuganol.epizy.com/vba_select_all_cells_in_active_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/adhikar_movie_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/peak._getfueled_answers_geometry.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/klinger_gasket_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/kakiwawodixe.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/mosilemifesonorejoxenos.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_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 5444 bytes
SHA-256: 7356b51aef39fa2b09648e89e621700c09304865d8f2c0f0bf9e4af10c9b1910
font_01_sfnt_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 11060 bytes
SHA-256: 086744e5678ebaf0713ff29e9eadd04b83b76f0af09b5f005bb464628013c8d7

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