Malicious PDF — malware analysis report

Static analysis result for SHA-256 a267ea90ede8ddc1…

MALICIOUS

PDF

76.6 KB Created: 2021-01-15 19:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c0cdf5e71b4e52b587c8bb4d3d36e92e SHA-1: eda37bc4ba0688326ce279182d5cffa2b1b6132d SHA-256: a267ea90ede8ddc11063ccc2f0e169bd601521037d20a08b4e96ed4e88d7f687
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, directing users to potentially malicious infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as phishing. While no scripts were extracted, the presence of numerous external links, including one to a known malicious redirector, suggests the primary goal is to redirect users to harmful sites.

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
  • 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://traffmen.ru/123?utm_term=gran+melia+puerto+rico+website In PDF document text
    • https://xinagele.weebly.com/uploads/1/3/4/7/134729321/9310995.pdfIn PDF document text
    • https://pikisavejalanab.weebly.com/uploads/1/3/3/9/133986241/zefilobo.pdfIn PDF document text
    • https://cdn.sqhk.co/zepinima/fhhGTgf/best_tuner_for_6._7_powerstroke_2019.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://s3.amazonaws.com/numegubowalonan/tisoxigam.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/62912127537.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/9408171777.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/tazanu.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/radioactive_waste_sources_types_and_management.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/jozos.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/11422701639.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/kimevebowulopu.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/11975111384.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/jujeniz.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/8663516559.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_off0000dec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC5 5224 bytes
SHA-256: b0203f0760e3845c5424bf71e5abce7a37b3e60d0e14a9e5610733841da7cadc
font_01_sfnt_off0000f079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 11008 bytes
SHA-256: 1e8e7e037abe4d025dc9398ec52d784daa1bd33e38da978c24377c33f89ec480
font_02_sfnt_off0001159d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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