Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed4bfd78db41a23…

MALICIOUS

PDF

71.2 KB Created: 2021-02-11 04:33:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 590a04de3de0a27e55d1e55d09fa0a33 SHA-1: e4d35f5b91ee859a386c94a483bfda4f6c28babe SHA-256: 8ed4bfd78db41a23c7cef1ce3312e9dbb32905a07e4c08f6cd601499d7a73434
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jottigo.ru/wb?keyword=bruno%20mars%20video%20songs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446643/normal_600fb6f593a51.pdfIn PDF document text
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/tikofa.pdfIn PDF document text
    • https://kivalake.weebly.com/uploads/1/3/4/8/134885121/2784158.pdfIn PDF document text
    • http://austritkfa.com/bowavisivu242nw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417534/normal_5fcecd4d425f2.pdfIn PDF document text
    • https://pexivepod.weebly.com/uploads/1/3/5/3/135346377/todifiroze.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/3d09be316af.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/megulu/2635639541.pdfIn PDF document text
    • http://somaxowirotiko.rf.gd/tokotigutajeka.pdfIn PDF document text
    • http://filutapokupa.epizy.com/ceasing_self_employment_form.pdfIn PDF document text
    • http://siwofemevap.epizy.com/nosujopakuv.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/cursive_handwriting_free_printable_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/android_9_or_8.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/tavagatado.pdfIn PDF document text
    • http://wuzuvulas.epizy.com/chicago_fire_season_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/56612804281.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/terutunepinasavopum.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/79359860788.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_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 5220 bytes
SHA-256: 04a6dd4a45c52f2101b39cde5f21191eeeba0e117116d19b403af2f7e45ae008
font_01_sfnt_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 11324 bytes
SHA-256: a5346e1306b74c29f2b5ee38a10e10a4ff64758154f3015d3def93c8c72d7b78

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