Malicious PDF — malware analysis report

Static analysis result for SHA-256 c141f682b63fda78…

MALICIOUS

PDF

67.6 KB Created: 2020-12-27 19:36:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d96fedcc16885f7d0097840bb001caee SHA-1: 7db85df394e2a348688845d53ba80f34f72c491e SHA-256: c141f682b63fda78984975060b855a3dc4ee2b4ed6a0f3645e29b23069a42398
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings suggest the document is designed to redirect users to potentially harmful content.

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://traffking.ru/aws?utm_term=classifying+triangles+graphic+organizer+pdf In PDF document text
    • https://pafofenolaf.weebly.com/uploads/1/3/4/6/134668810/xigizu.pdfIn PDF document text
    • https://suzitarux.weebly.com/uploads/1/3/4/6/134683800/2299553.pdfIn PDF document text
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/tuluwe_pukixideti.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/5401885.pdfIn PDF document text
    • https://bixanizutojez.weebly.com/uploads/1/3/4/4/134490846/5320150.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/150fc9b1-f762-4743-9a1a-7dcc23036968/71880638463.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/54974411148.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/11690434018.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/kosipefojapubowus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f4bca0-beec-4806-a7ba-90f034bf5108/south_carolina_vehicle_property_tax_calculator_horry_county.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/adobe_photoshop_cs6_free_full.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_off0000ce65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE65 5472 bytes
SHA-256: 13825c0bc563ff3ca15cd2e00e3a319fea3a43a85f0591e774201eef8154d290
font_01_sfnt_off0000e110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 9616 bytes
SHA-256: 2a0ece005a91600ead9976c27024fcd021deb524c5848c18a31150ce79294b80

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