Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab884ae3aaac2a0d…

MALICIOUS

PDF

63.8 KB Created: 2020-11-17 05:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a250c0e3e9b702282817ed3f402693ac SHA-1: 1abc73ca4f17a5b13620487b441698b7f444c898 SHA-256: ab884ae3aaac2a0dff5304f03cbbba3d4fa794f25e553865ff827d53354855e2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of a PDF link farm, with numerous external URLs, suggests an attempt to direct users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution vector.

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://trafffe.ru/123?utm_term=db2+sql+error+sqlcode%253D-551+sqlstate%253D42501+sqlerrm PDF link annotation
    • https://kepupumi.weebly.com/uploads/1/3/4/6/134616340/1833315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387033/normal_5f94334a16504.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/kekifafonusidit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_5fad6865973b4.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/57b25d78-7681-4ade-8d38-4602610e7e43/dosozipoxajixagasokuxet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dae2f85d-49de-480c-a9b3-e0a53d45b708/vobozabor.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/patuxent_high_school_twitter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a871591-9f9a-49d8-bee0-e5379e629e27/kimuwumotajix.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/tax_deed_sales_putnam_county_florida.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/19997435512.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/67723738603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fccd2877-c0d1-45d6-8735-6c57c467d747/nujubozigojidupufuba.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/48341001668.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_off0000b6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D1 5968 bytes
SHA-256: 21353d66e4681950b4f22edaf9c5e9da091e1a510d61b1f501ca26d235962964
font_01_sfnt_off0000cb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB22 11696 bytes
SHA-256: 15ba80ca2ea8cf8f585f33a5d5092f6579740504b490771f5e6c17c334728d2a

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