Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa75b8fc99bbecda…

MALICIOUS

PDF

71.5 KB Created: 2020-12-20 11:26:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: af9c5692a33ae8a7c50abf868fc108bd SHA-1: 1202c9989374140d0c4d57bd26d6391f6f8f59ba SHA-256: aa75b8fc99bbecdac796875f2125580ea13620d66947778afe596b52a8fa89e1
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

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
  • 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://gettraff.ru/strik?utm_term=covered+bridges+in+western+maine In PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/2d2b07cd700b241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376099/normal_5f93e61b3ca0b.pdfIn PDF document text
    • https://kojelokawuzu.weebly.com/uploads/1/3/4/3/134341929/9320c0.pdfIn PDF document text
    • https://gupimarozak.weebly.com/uploads/1/3/4/3/134350981/bc475a871.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380881/normal_5fc3fb45dd67d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468537/normal_5fc8faa233e8a.pdfIn PDF document text
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/wutowefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391015/normal_5fc35f3c8b379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472484/normal_5fbc190fc4a5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5fa5ea8d38d4f.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/1256912.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/bajapovogam/66379693664.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/criminal_minds_gideon.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/rizunuguwafu.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/bidozevopum.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/20230836026.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_off0000d929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD929 5312 bytes
SHA-256: 9fe9a777f504c59c9c9345c28f42a4a8a3e7ea5b111f4f4fef161530ba48f359
font_01_sfnt_off0000eb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 10556 bytes
SHA-256: b24c6f71495981ff70e05c60425e496dae4e350927dbcbf3194b630b81d7bd11

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