Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f9ee9875bb518d…

MALICIOUS

PDF

86.9 KB Created: 2021-01-15 22:13:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 11c3c98c8bafb303458fa11e88fcb363 SHA-1: bd17b9047909ff70e6835db50aaaad22b7d957fe SHA-256: 28f9ee9875bb518dbf0aeae62e85a626c8887026362cf91df99a648f2ef06276
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 at least one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a tactic to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to 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=american+government+roots+and+reform+chapter+1+summary In PDF document text
    • https://bilunoxenaxu.weebly.com/uploads/1/3/4/4/134474733/vuvigufi.pdfIn PDF document text
    • https://soluvixam.weebly.com/uploads/1/3/0/8/130873975/zujiru.pdfIn PDF document text
    • https://fafemuwupid.weebly.com/uploads/1/3/4/3/134368635/degopozo.pdfIn PDF document text
    • https://gatamerat.weebly.com/uploads/1/3/4/0/134000446/ladozuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495994/normal_5ff8bf1fb0946.pdfIn PDF document text
    • https://xatotowo.weebly.com/uploads/1/3/2/7/132740458/detevovolomol.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/pokixovuxik/messenger_lite_apk_uptodown_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/64875691706.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/getamevirijanot.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/collective_nouns_worksheet_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/92721413666.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/xunetawaxuvede.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/letavodev.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_off000115dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 5740 bytes
SHA-256: 6cb9402076248eaf08363ea785f2d6b5908562468fee75e92bc0f6506e19e2d2
font_01_sfnt_off00012950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12950 11212 bytes
SHA-256: 9426ef17981c62178320b067a29afbac67d0ed9475a3c7d3ce9f23dd342afbd8

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