Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a135357df13cd11…

MALICIOUS

PDF

71.2 KB Created: 2021-02-21 05:23:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 9aebe8d7a4ef2e556b5db8476a201045 SHA-1: 9fefdc2092bd87d8e15d039906cd979572b913a8 SHA-256: 4a135357df13cd118d02d8274deaef9f675ba350686706150f9ac0c5f254dd15
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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+dark+knight+apk+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4424991/normal_5fd63c36bb15b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_60225b686285f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448332/normal_5fee23fd53b33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393029/normal_602d3d0b89264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446151/normal_6017c6b42f933.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402503/normal_5ff168482787a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454984/normal_601797e0b0e2c.pdfIn PDF document text
    • http://braco.ru/fasijunafudakf6v1y.pdfIn PDF document text
    • http://dirtygirl.fun/sifatusqpy5v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418167/normal_5fcb15e6e3d1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378608/normal_60044c576910a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446924/normal_5ff4fa2327a8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455198/normal_5fc667ba66d15.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/fixararololu/the_prestige_movie_tamil_dubbed.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_off0000db92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 5232 bytes
SHA-256: 7489cc651804011112ebe4776573f08a7ad5ed7b8b05b019998706079f3ad2c4
font_01_sfnt_off0000ed6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6D 10132 bytes
SHA-256: f0552142b9f25a29a0646b9b25e3a687882dfeb6945c0b71c1057f589a5a2b25