Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b1c2937027ff93…

MALICIOUS

PDF

89.1 KB Created: 2020-12-26 17:03:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: bbcf352852aa4d930e2434d45482c1ba SHA-1: e728779c0f53bf733105bb2d78dd50ae810c5735 SHA-256: e2b1c2937027ff93fd13d2d00785c359b2b2e6aa20beab1ca21b41da26519574
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 large number of external links, many pointing to Weebly hosted PDFs, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

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
  • 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://traffine.ru/aws?utm_term=free++animasi+power+point+bergerak PDF link annotation
    • https://malolikekex.weebly.com/uploads/1/3/4/7/134718462/popogeluni-pafepifalozejel.pdfIn PDF document text
    • https://xogaketur.weebly.com/uploads/1/3/4/5/134593565/8479433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484358/normal_5fb7ed0195b51.pdfIn PDF document text
    • https://zozelezike.weebly.com/uploads/1/3/4/4/134434207/bimowepikajob-serenajigeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380237/normal_5fde9f85e28bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446388/normal_5fc3deb3051d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5fafa8d1c91b3.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/kudefem/android_8._1_oreo_vs_ios_11.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/the_backyardigans_the_yeti.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/bixoxupemuzeniluza.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/80094997020.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_off000120d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D7 5356 bytes
SHA-256: 53d9a6b8dd910dde9021241afc8ab5fc2836aa4588268c91913d85203f9d8e70
font_01_sfnt_off00013310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13310 10684 bytes
SHA-256: e006bc78d59a87db2381b97edc413fe8c3819efa381c34d23cd8b0bff660f9bc

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