Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c170fb4d27d5d9…

MALICIOUS

PDF

71.7 KB Created: 2021-02-14 08:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 5c2017dc3ca4018101150f7d435e07c3 SHA-1: ef566b71d167bc3c3bba110e10ef94cb9277d735 SHA-256: a9c170fb4d27d5d9e96ef8a57746f8426e088261cb0fe993377a22ce8ade2fe0
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=what+is+a+balanced+fund+at+vanguard In PDF document text
    • https://static.s123-cdn-static.com/uploads/4473926/normal_5ff4b3b5d628c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463034/normal_5ff64a5c2f07d.pdfIn PDF document text
    • https://girewatadetax.weebly.com/uploads/1/3/2/6/132681062/1001206.pdfIn PDF document text
    • https://pixiguva.weebly.com/uploads/1/3/2/6/132681827/74acb6eda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456998/normal_6004e1e82fdcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476011/normal_601fb00cb1693.pdfIn PDF document text
    • https://mitigifagoted.weebly.com/uploads/1/3/5/3/135325532/2890866.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/wusigipufuvowix/tatudoga.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/36856597244.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/62639669532.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/xunuzibowiw.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/patex.pdfIn PDF document text
    • http://nalosig.rf.gd/4th_grade_saxon_math_book_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/ye_savita_full_song.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/organisme_de_formation_tva.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/dekalibobexobavi.pdfIn PDF document text
    • http://rozipiliwune.epizy.com/bpsc_admit_card_2019_official_website.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/finataxetiko.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_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 5496 bytes
SHA-256: bb16985fe3eb7c9f1dce4869927c9e6cdac9229cf5ed6cfc5a301f029115a12f
font_01_sfnt_off0000ed9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 10492 bytes
SHA-256: d441f9f4736b53dcf31baa02ccc6df4aa1771801ae80056f93aebe87c33b90b6

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