Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d88783d4c540160…

MALICIOUS

PDF

77.8 KB Created: 2021-02-17 20:28:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c48040f8da67052847d7277ca8b95157 SHA-1: b344bbe959b4d26af3497e16f4a1009c21ebf298 SHA-256: 4d88783d4c54016048f0ee315d3254d84f456ea45c1fe6bca775edaffef94687
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to known malicious infrastructure, specifically identified as a redirector for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to medical symptoms to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/wix?keyword=keratosis+obturans+symptoms In PDF document text
    • https://static.s123-cdn-static.com/uploads/4366961/normal_5fcbfe29cfb6a.pdfIn PDF document text
    • http://top-agent.ru/moturubisojanuw0bxx8.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/xagavoradedanunawigetara3vfu9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420434/normal_5ffbbd63c03ec.pdfIn PDF document text
    • http://doctora.club/orexigenic_peptides_arcuate_nucleuspo4nz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467975/normal_601968e2b2b33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374175/normal_5fcef3163d1e0.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/jupunuwomerogobakxcdm.pdfIn PDF document text
    • http://bitcoins-profits.com/20318594414aoeky.pdfIn PDF document text
    • http://winfreeiphone.xyz/90678183029o8mea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382772/normal_6025ff622e96b.pdfIn PDF document text
    • http://eeuuurrrrr.space/vutedavububomagosarafobut7l52g.pdfIn PDF document text
    • http://braco.ru/guess_men_s_cologne_seductivev3ep1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417429/normal_5fc897ab2fc77.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_off0000f45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 5144 bytes
SHA-256: 73a3e36832b74d3f0991b34b7fbaa0765cbc13a2cf45f17365dea00eb9342a20
font_01_sfnt_off000105c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C9 10628 bytes
SHA-256: 2af9490bfb30e5eaad8a78f4debaa52ba55c25f0e0945b7ffe88f710628076f6

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