Malicious PDF — malware analysis report

Static analysis result for SHA-256 af05a4c5af0fc754…

MALICIOUS

PDF

75.8 KB Created: 2020-12-03 15:35:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d3399fffcd4fb72e10e87b133d4bbeee SHA-1: 18ff18614e01f68d2d333a161d90c57c0896222a SHA-256: af05a4c5af0fc754b5ea68e6a97c7a5222fdcf18d1a9694cbc97e565b5152a02
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing sites or malware downloads. The presence of a malicious redirector URL and a link farm on disposable hosting suggests an attempt to obscure the final destination and distribute potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=anniyan+720p+hd+video+songs In PDF document text
    • https://mibuxinuk.weebly.com/uploads/1/3/4/7/134753888/butowasi-digemufi-gizejidekugu-tavigobajunawob.pdfIn PDF document text
    • https://pitiwiju.weebly.com/uploads/1/3/4/6/134687602/xakeku-vusowepekagowe-jaladudavipo.pdfIn PDF document text
    • https://bugajikiwolano.weebly.com/uploads/1/3/4/4/134471946/samuk.pdfIn PDF document text
    • https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/6075635.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457279/normal_5fc49639e1d7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f875617dc2fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1b86173fb5383b6a81e1/1606294414806/how_to_write_an_autoethnography_proposal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e55e51f-c332-45f4-9a05-d8edfd3ccf53/tojiwirejepegu.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/12552311570.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d49a16f6d44b07be6b5d/t/5fc1a872bc819f1cf417012d/1606527090431/digi_clock_widget_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/796a8b49-e6cf-4d40-9505-04baf79bb54c/11008939423.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6666e27a199023adae7b0/t/5fc84041b74dd54858d2106b/1606959169910/modern_on_the_rails_mamaroneck_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1dedb24-f837-45b4-9a9b-a08f9a189866/fubataxiwazufadiwobufug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba54264e-99cb-4a54-9be8-087eb8445680/8989671477.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_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 5596 bytes
SHA-256: d8e4f6555698ddcb297847c9a5860d9a08484be2b694de5f4ca3af5829ea1e94
font_01_sfnt_off0000fc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 10952 bytes
SHA-256: 481b59d87a26fa60042fc4ae8182f557cd6b5152eedc5a4dbca586814fad6967

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