Malicious PDF — malware analysis report

Static analysis result for SHA-256 27de7e3401693663…

MALICIOUS

PDF

70.3 KB Created: 2021-02-20 04:47:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: bc3d8d9b5113fd521a89cc64f1f5656a SHA-1: e697b0d1263b601d8f840abb1e4ba47c8c92bc66 SHA-256: 27de7e340169366395ea29897369e744204b0c23713df1f540b3b98a6736e78c
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=acited+esenciales+diario+pdf+gratis In PDF document text
    • https://static.s123-cdn-static.com/uploads/4423471/normal_6000db5f333c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497078/normal_5fea00c16638f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471484/normal_600c20925e3d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379856/normal_5fca4e40439e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387582/normal_5ffe97e3eaede.pdfIn PDF document text
    • https://sabiwivilo.weebly.com/uploads/1/3/4/3/134316676/8809743.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484114/normal_5fde37d55c638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387813/normal_602816a85058e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445726/normal_5fd8f864bd20a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_6014f3079a17c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481839/normal_600503e87bb1e.pdfIn PDF document text
    • https://vulewerogoxo.weebly.com/uploads/1/3/4/5/134507491/kurigirija-zikimof-magujiwizi-temobenu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504839/normal_5ff3d32d05f1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455374/normal_5fe7d5bf8db1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448121/normal_5fde8231ae740.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jedejetitafabi.rf.gd/vojatibini.pdfIn PDF document text
    • http://nufudojor.epizy.com/bupigurupijikewidanilape.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_off0000d226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD226 5312 bytes
SHA-256: d853fe4531d08dabb6c6d80259f60a8b6d62aeab3423a0542be6ce7f52fa1af0
font_01_sfnt_off0000e44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 11948 bytes
SHA-256: f6e27bd57b45b681b93d97b81a99eda0f8cf97d3d42dd6969837f18195deb0e3

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