Malicious PDF — malware analysis report

Static analysis result for SHA-256 06f9f5b4c2bfcdad…

MALICIOUS

PDF

69.3 KB Created: 2020-11-22 04:14:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: bde7842f36c7a15f98157e2b912cb274 SHA-1: bbfee34c8cd9c191e9c870f1d3dfec06c4c81f16 SHA-256: 06f9f5b4c2bfcdad2301e62b1f64bf6cd4eee088f5d174f36d7b20a5f1ee6468
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to unit conversion, likely to mask the malicious redirection to a link farm hosting numerous other PDFs.

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.
  • 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.
  • 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://cctraff.ru/123?utm_term=convert+25kg+to+lbs In PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/kezupukono.pdfIn PDF document text
    • https://vibitaxipeni.weebly.com/uploads/1/3/4/5/134526550/pebader.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_5fb5bff70258f.pdfIn PDF document text
    • https://gunulavosaki.weebly.com/uploads/1/3/4/3/134374607/9bb585c7e1.pdfIn PDF document text
    • https://mefogogid.weebly.com/uploads/1/3/4/6/134600117/1117284.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/9031774.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/purawuma/puduripojasigutebopeweki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e81708-3028-42bb-81d8-01740354ee34/zemibajizogigibokajifa.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/benaam_sa_ye_dard_talat_aziz.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/rekilasazamabevabufuk.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/79902149042.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/rowesovi.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_off0000d461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD461 5068 bytes
SHA-256: a3e06ca64e01de7981c64f4e997f965b88ef5c10ab8c91b337c4fb3368d76233
font_01_sfnt_off0000e5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BF 10516 bytes
SHA-256: b28628ae25c67c0637e63dc71f610fa03bd9740ff1db17783e12346483d1f4e7

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