Malicious PDF — malware analysis report

Static analysis result for SHA-256 998bb6ebbaf9e60a…

MALICIOUS

PDF

69.2 KB Created: 2021-02-15 19:47:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 41437b81a2daa27bcbc0269cc98a49c8 SHA-1: 035559f3aa754c39a6cc0c21af558cd0bf538acf SHA-256: 998bb6ebbaf9e60a8997454764cadbbbbb2c08938750651295dd52e64834a540
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=the+great+gatsby+essay+questions In PDF document text
    • https://fejevudud.weebly.com/uploads/1/3/2/6/132695511/6673527.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472774/normal_60133ee46744b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465690/normal_6015d054cbfe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472773/normal_600f4a31ac01d.pdfIn PDF document text
    • http://www19216801.site/exercises_on_tenses_with_answersacku2.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/jbj7lln/1181044758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_5fda15f9a0b1e.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/viiQzvB/82485055114.pdfIn PDF document text
    • https://cdn.sqhk.co/fatidizeru/C6jj4id/jubilarifuwenej.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/9jjB6gd/mukireririfusaxugewe.pdfIn PDF document text
    • https://juxusuvib.weebly.com/uploads/1/3/0/7/130739690/9633476.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377410/normal_5fccb02dce154.pdfIn PDF document text
    • https://cdn.sqhk.co/lutadamafe/jd5NWhg/zukerozawekesumelanemu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478716/normal_5fce802966821.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD360 5232 bytes
SHA-256: cba2ceaccf848dbf06b7418a03be117ced757a5e66680635015399ae0dd0eaaf
font_01_sfnt_off0000e52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52F 10160 bytes
SHA-256: b6ef68160d42a2e51b924c7d258d35048377e1485fbbfd9818bd7fa882792353

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