Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b3240fc5b379ca…

MALICIOUS

PDF

79.4 KB Created: 2021-02-25 13:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: b747eea408ef207f327d95bf4c97ad1d SHA-1: be5ac162bf04f1bd953f613a6b90a3969feeb441 SHA-256: c6b3240fc5b379cafdcef27cb7b053d6d80850fcb507a78b54045246d1b41fc4
254 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
  • 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/award?keyword=why+does+my+whirlpool+refrigerator+leak+water In PDF document text
    • https://cdn-cms.f-static.net/uploads/4447270/normal_5fd68048af459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454977/normal_6033b7bc1543d.pdfIn PDF document text
    • https://visofebofoxofub.weebly.com/uploads/1/3/0/8/130814652/6b9c59564e16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391620/normal_600e4e92ea52d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450250/normal_6004b23ac9177.pdfIn PDF document text
    • https://tiforunu.weebly.com/uploads/1/3/1/4/131437018/a5784e02c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5fcd38b96a0a0.pdfIn PDF document text
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/130785.pdfIn PDF document text
    • https://nikirepe.weebly.com/uploads/1/3/4/7/134743809/wavefalejol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372087/normal_6004d53102af1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369323/normal_5fe388db5c241.pdfIn PDF document text
    • http://busforpay.online/158833347803omup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wobazopaf.epizy.com/nescafe_capsule_guide.pdfIn PDF document text
    • http://ligafima.rf.gd/mosuvasodiforabedi.pdfIn PDF document text
    • http://lusunumef.rf.gd/70845603727.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_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 5724 bytes
SHA-256: 0f4555d59d5e0e4cc813c889d7ff32343f3e00de2a6564b62cd79b2f0aa31e5a
font_01_sfnt_off00010dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 10136 bytes
SHA-256: e7207f40a7cd8de9d2818d8e798a76131cee81c43ab8f1a4570adba20a6f19d2

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