Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9979153fd3a8cc9…

MALICIOUS

PDF

73.0 KB Created: 2021-02-10 18:43:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 0362a5b473f01a5f88aa5a8169bc86d9 SHA-1: f2f3fe815545b284239ffb161afcfba2b32aaa19 SHA-256: a9979153fd3a8cc9ca9509e9e7deb5eeb07e3671184ab2316ecd0c97a0453a96
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/wb?keyword=profit%20and%20loss%20template%20ebitda In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481988/normal_60221af4bca81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392215/normal_5fffc3fb21e88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500453/normal_5ff81e001c120.pdfIn PDF document text
    • https://notalajamuneno.weebly.com/uploads/1/3/1/3/131378915/662019f436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_6010a96806d1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409243/normal_600a58a03d8ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xajumin.epizy.com/53405898276.pdfIn PDF document text
    • http://datidogebe.epizy.com/poxipogap.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/android_adb_devices_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/fingerprint_attendance_system_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/mercedes_sprinter_specifications.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/mexutotil.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/86330960596.pdfIn PDF document text
    • http://dojirezanis.epizy.com/nukozajaridibo.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/armitron_watch_manual.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_off0000dfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 5328 bytes
SHA-256: d071b74e389170b89af63135d09929f0922df6817b8bb96d3d58346b5d620b3c
font_01_sfnt_off0000f1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 10908 bytes
SHA-256: bc3aedf96cc2593a3f38e962d76d8ac33c890ae80685654de83267ee770e84f2

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