Malicious PDF — malware analysis report

Static analysis result for SHA-256 cefd9049645339d5…

MALICIOUS

PDF

77.8 KB Created: 2021-02-18 02:20:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c7b8025b50d9234c5158e6de11b15b16 SHA-1: 40d19cbac05db34639c963ee4657d974b9ff59d0 SHA-256: cefd9049645339d5d46b03342d8a84d0ee30446526c41f83ea97e33b58497f12
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, which is a common tactic for SEO manipulation or to host phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the linked URLs. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://bologen.ru/123?utm_term=eucharistic+minister+requirements+catholic PDF link annotation
    • https://cdn.sqhk.co/nizekidido/Rif61ij/23535557117.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470679/normal_5ffe8cd1d1afe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501963/normal_5ff35b867b8ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380675/normal_5fe4d7003e671.pdfIn PDF document text
    • http://freehookup.xyz/what_affects_blood_pressure_short_termhyb2f.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/0ihUjdf/fuzojelitetakepawo.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/AifzgjC/22878608810.pdfIn PDF document text
    • https://cdn.sqhk.co/xozirijor/Qp2hggh/domain_name_availability_api_free.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/ghehgjc/minecraft_pe_modern_redstone_house_download.pdfIn PDF document text
    • https://suxegetolikas.weebly.com/uploads/1/3/4/0/134097713/kejesaz_motatedekamar.pdfIn PDF document text
    • https://cdn.sqhk.co/kifavubivelo/hiHgfHq/leduvafegu.pdfIn PDF document text
    • https://cdn.sqhk.co/pufojoloz/M6qgijb/dopemolimemeti.pdfIn PDF document text
    • https://cdn.sqhk.co/banuluwopote/fZijspd/puwas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415962/normal_5ff92af527afa.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/oDVhcMW/35336473514.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_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 5124 bytes
SHA-256: 9dfa0a3c82f6a7f0f48705ebcde60463d4f7a00163fbc00e93157f150a8f02c8
font_01_sfnt_off000105f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 10552 bytes
SHA-256: 7c4956dbd27114c7c4deac0c84661b5afaf5f3a481b900f6807e03dee27b5d9b

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