Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cfe18f7448d0875…

MALICIOUS

PDF

73.5 KB Created: 2021-03-12 17:52:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 211e1d43ecba92bcae69883c69436879 SHA-1: e0f9949c58cff8f1c514ac3b74b349f7b39c262b SHA-256: 1cfe18f7448d0875cf5ff2be3234ff3830131caea017fa7e88cbbd48c3ad362f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The presence of multiple unknown URLs and a ClamAV detection further supports a malicious classification. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

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://soxebez.ru/123?utm_term=banzai+pipeline+oahu+surf+report PDF link annotation
    • https://kikitepolo.weebly.com/uploads/1/3/4/5/134514310/87053.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454982/normal_5ff5db7f5320d.pdfIn PDF document text
    • http://jepegupunu.mygamesonline.org/liziwemodoxafop.pdfIn PDF document text
    • https://vijekufimukij.weebly.com/uploads/1/3/0/9/130969895/5cac48954.pdfIn PDF document text
    • https://rugekake.weebly.com/uploads/1/3/4/5/134518704/sefazul.pdfIn PDF document text
    • http://luwinilulurop.mywebcommunity.org/71352712204.pdfIn PDF document text
    • http://kajipim.mypressonline.com/teleological_vs_deontological_approaches_to_ethics.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/gixafakiniwilon-xewal-laregodafu-mesaboge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425483/normal_5fcb181476c04.pdfIn PDF document text
    • http://nitafibejuze.mygamesonline.org/91446080130.pdfIn PDF document text
    • https://jelugofinetala.weebly.com/uploads/1/3/5/3/135389066/bb38a232a.pdfIn PDF document text
    • https://sajofagexureleb.weebly.com/uploads/1/3/4/6/134652103/717067.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/lefemijip/rusinumifinigeweg.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/sentry_safe_error_code_3_beeps.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/seralibukabika.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/teacher_s_guide_wonders_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/78546271995.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/jeserepujozevixuripi.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/19199801271.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_off0000e25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 5088 bytes
SHA-256: 4cc5ace31967bef75970a4dce4ca1a628e5da3a63be3f55c9019776125ac5110
font_01_sfnt_off0000f3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 10800 bytes
SHA-256: f1283b5303ecec0aac6b40eba23d710c65eced2fceeb5d4ea5499380742b3a8f

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