Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca4bd2fa33261ba…

MALICIOUS

PDF

72.5 KB Created: 2021-01-12 17:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 16cfc108babed678a9bfe05ab961c4ec SHA-1: eb8839c084671973254b96e09dfdc8854336c4ca SHA-256: 6ca4bd2fa33261ba71fff8cdff01342286c6c9811e4cdf54fcdca0fb7cc8d589
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic identified a link to known malicious redirector infrastructure, and another noted a mass external PDF link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://ggtraff.ru/123?utm_term=blade+and+soul+optimization+guide In PDF document text
    • https://site-1177607.mozfiles.com/files/1177607/spiralizer_zucchini_recipes_with_shrimp.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/7655351.pdfIn PDF document text
    • https://sazejorewisiboj.weebly.com/uploads/1/3/4/4/134459615/gamozu.pdfIn PDF document text
    • https://site-1171953.mozfiles.com/files/1171953/dokikejojixedurav.pdfIn PDF document text
    • https://fujimerikav.weebly.com/uploads/1/3/4/3/134307110/sunuwejefowulisetom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pidufozu/55124297232.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/wabipojufaxared.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/bank_exam_gk_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/pisagoruluwizuzatusadu.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/rivavusetesosejet.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/newewifenudumu.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/9186442307.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/garos.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/devi_chitralekha_ji_ke_bhajan_video.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
font_00_sfnt_off0000d17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17D 5164 bytes
SHA-256: 88ddec71099b4dac1a64f8d0b55e1bc597ebc25fdf1e5cf329421799bdfc5cf4
font_01_sfnt_off0000e303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 10596 bytes
SHA-256: a3690a9b056185a42a067047cb54453e9c4dbdce923753dd8fe40c2e1dfb7fbb
font_02_sfnt_off00010750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10750 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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