Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35934870ee68880…

MALICIOUS

PDF

84.9 KB Created: 2021-05-25 13:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 29c67e71b63258fc8b41871b1f7b96e4 SHA-1: 3c0501afb97fe1829dff14545003326ef124f089 SHA-256: b35934870ee688808896fcc9cbe31f912e809df6c354bf59b7485192308d4569
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 large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious lure.

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://jumiwimov.ru/strik?utm_term=eyeshield+21+episode+16 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379486/normal_6063187978d9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459325/normal_5ffd0cc15690b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_600dcb40e0372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468289/normal_60223aa5a8405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_603146ad6e6e1.pdfIn PDF document text
    • https://senobatupubem.weebly.com/uploads/1/3/1/4/131437889/f0b52511cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472774/normal_603fcadba2e29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467038/normal_5fc7461b115bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475995/normal_602527be8a602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443588/normal_606bcfd3842e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390381/normal_60081f4944987.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496153/normal_5ff8452927ce4.pdfIn PDF document text
    • https://xijafidul.weebly.com/uploads/1/3/2/3/132303061/c19770f92de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421201/normal_6022280b53642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464314/normal_6067918c7edb9.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/zamuriza/airplay_mirroring_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/84746020702.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f5d9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF5D9 6816 bytes
SHA-256: 2bfb981da8c38a04d7549b22b90fd734a3e0fd47ae1aa73dd79ac7ac31094df4
font_01_sfnt_off00010d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 5136 bytes
SHA-256: 9446e6c9418a75333a0877ee57bcfcd03edf5238d1f10baf59816eccbc03d3de
font_02_sfnt_off00011e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E94 11584 bytes
SHA-256: 08a220198a7e0e0e7bea532603e28417332c48ae0ab50a991c50b78933028999

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