Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a71db3cc940893…

MALICIOUS

PDF

66.7 KB Created: 2021-03-04 05:55:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 94ac75f09b5de289ef3bfa49fc54c27a SHA-1: 7442aaf26b412a42fb6770b563e3be40c4803447 SHA-256: c6a71db3cc9408934d1b024ec135bd6f88925648c05c6c170d20dbbba278f82a
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://yafferge.ru/wix?keyword=climateright+5000+btu+portable+air In PDF document text
    • https://ladolijid.weebly.com/uploads/1/3/2/8/132816107/butizapu-popumatomot.pdfIn PDF document text
    • http://wersita.fun/meteruwewosa4ueo3.pdfIn PDF document text
    • http://reduslim-ordina.site/auditoria_fiscal_livroiu1bn.pdfIn PDF document text
    • http://predouche.xyz/64622771198focj6.pdfIn PDF document text
    • https://lepomanorep.weebly.com/uploads/1/3/4/8/134856804/8736927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377400/normal_5fd81dbdc3f61.pdfIn PDF document text
    • http://habercigo.com/game_theory_textbooks11ef.pdfIn PDF document text
    • https://zegusuvi.weebly.com/uploads/1/3/4/7/134738546/bedevupadi-rudowi-wemuwogorabumix-xulasapoma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403415/normal_600658d1d4557.pdfIn PDF document text
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/360e04.pdfIn PDF document text
    • http://study-english-02.space/freckle_math_app5788f.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/jolozidabi/goduzob.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/backup_iphone_to_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/coliform_bacteria_treatment_in_water.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/31103098775.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/kiwab.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/tumuxunipojonidarip.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_off0000c895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC895 5364 bytes
SHA-256: e6bea1bf879c88d1c3aaec8404eabd51be2b06cb9b78979555bf8f4d089d4ec3
font_01_sfnt_off0000da9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9E 10400 bytes
SHA-256: e072bac569c3f5352a0e67035f296f6c07fc81ed34ce80b22c8e86ceba56b3ed

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