Malicious PDF — malware analysis report

Static analysis result for SHA-256 111589cb58c21953…

MALICIOUS

PDF

78.4 KB Created: 2021-01-03 12:06:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f8a8248de4dca3372280ce5030434640 SHA-1: e435b8e32cbafdec5c0ff114256602ffb14681ef SHA-256: 111589cb58c21953add6ea480b9c0e3a7841505f72ca2e2d1255e79ce922d1b8
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 suspicious domains and are flagged as a link farm. One critical heuristic indicates a link to a known malicious redirector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/aws?utm_term=adding+and+subtracting+fractions+worksheets+grade+7 In PDF document text
    • https://gotagifegu.weebly.com/uploads/1/3/1/6/131607164/2632793.pdfIn PDF document text
    • https://febixitojujemo.weebly.com/uploads/1/3/4/4/134402622/fotivasa-dakud.pdfIn PDF document text
    • https://pafofenolaf.weebly.com/uploads/1/3/4/6/134668810/xigizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479441/normal_5fdc196f0d7a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478408/normal_5fd8ba903ebbd.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://uploads.strikinglycdn.com/files/819a1d2d-5a96-4738-88e8-082eb1a9a45e/luwotefatopovare.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/55576571211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/963c151a-70c0-400a-a9f4-b7c0efc8f761/real_environment_xtreme_4x4.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/26677577531.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/sovavejedizaboxezog.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/nuzulejok.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/definition_of_bimanual_examination.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_off0000e536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 5496 bytes
SHA-256: 975034c270ccbeaf1ca868b13ffb8fe0a82be87d25525f40ad8c7fca52fcf161
font_01_sfnt_off0000f7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 10528 bytes
SHA-256: 8c6a93388c4ebef3ad1c07a83e82096489de166a964ccf968c3a09427ab20f97
font_02_sfnt_off00011c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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