Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30b58d9fab339f4…

MALICIOUS

PDF

73.5 KB Created: 2021-02-25 08:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cbe5a8b2e4eebeee4b662afa681e2f61 SHA-1: 01292b6d4a0c2dbc67b42c671b4875ffa92c6495 SHA-256: b30b58d9fab339f4efde38356f45d2e5a78986f2eb2110c859bc3ef1e5123327
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 potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=korean+grammar+in+use+advanced+audio PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418584/normal_5fee86ecdb5ff.pdfIn PDF document text
    • http://kutalevewomem.22web.org/rokekonujemosomakow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402486/normal_6016acbfaa95d.pdfIn PDF document text
    • https://mibuvenatevuwo.weebly.com/uploads/1/3/4/6/134607329/morexitel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394060/normal_5ff4193b47ca2.pdfIn PDF document text
    • https://wosufibataba.weebly.com/uploads/1/3/4/8/134866098/8d1dc6eb5.pdfIn PDF document text
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/zupaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446151/normal_6017c68ea7a3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383149/normal_5fda3cf3e1bba.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/tikofaketonub/83553513163.pdfIn PDF document text
    • http://fatofugo.rf.gd/luxajokinadadoma.pdfIn PDF document text
    • http://relamelekubapan.epizy.com/wanitubukavasu.pdfIn PDF document text
    • http://jusudab.epizy.com/texniccenter_beamer_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/56868704595.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/noluxuxegimuvibali.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/2282025408.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/hibiscus_petroleum_annual_report_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/asme_b31_3_process_piping_guide.pdfIn PDF document text
    • http://fiwipofel.epizy.com/85151752973.pdfIn PDF document text
    • http://vevenamefod.epizy.com/bearing_capacity_of_stratified_soil.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_off0000cad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD0 6756 bytes
SHA-256: 47c33f273811bbfa0587f6c053b54239b154651b18d28831535d79126527370c
font_01_sfnt_off0000e0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 5256 bytes
SHA-256: 200714ca1c08cf93f6c26db115dc1f593e31053fb5c50ccfd9506ccf00b03a6e
font_02_sfnt_off0000f2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 12152 bytes
SHA-256: 5d37d1e23fb6e8ed75879527560152349baa3de393ad01de55ed456da2481f9e

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