Malicious PDF — malware analysis report

Static analysis result for SHA-256 4333eeaeef9daba9…

MALICIOUS

PDF

103.3 KB Created: 2021-01-17 08:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 54ab0372dcddba9ea1d897d20c952faf SHA-1: ba02fcf7dda73825aab16651a561b4528d5018aa SHA-256: 4333eeaeef9daba9d72b63c308c8ec5f85102345009c202c621b9e16f791ab21
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, including one pointing to 'traffset.ru', suggesting a redirection or phishing attempt. The PDF structure and heuristic firings indicate it's designed to host a large number of links, likely to distribute malicious content or phish users.

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://traffset.ru/123?utm_term=historia+del+pensamiento+economico+linea+de+tiempo PDF link annotation
    • https://cdn.sqhk.co/rinilafexowi/uYhjpja/zifofudemizerasozuw.pdfIn PDF document text
    • https://bixowupe.weebly.com/uploads/1/3/1/4/131409305/degedaxidu.pdfIn PDF document text
    • https://zoxalutaj.weebly.com/uploads/1/3/1/4/131407742/ligebe-bumuxaxejukej-dubanajuxu.pdfIn PDF document text
    • https://site-1177725.mozfiles.com/files/1177725/marketing_automation_software_free.pdfIn PDF document text
    • https://vulazijol.weebly.com/uploads/1/3/4/6/134648863/d5988df9.pdfIn PDF document text
    • https://vofepelatuj.weebly.com/uploads/1/3/4/7/134768647/5249831.pdfIn PDF document text
    • https://kunoloxudiruk.weebly.com/uploads/1/3/4/7/134767428/8545969.pdfIn PDF document text
    • https://tagopebarezixog.weebly.com/uploads/1/3/1/6/131607889/9699923.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/genedonapubefe/76403826280.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/format_code_sql_management_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/heathkit_as_1348_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/block_ads_on_your_android_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/dotibujivum.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_off000156d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D6 5180 bytes
SHA-256: 71e0344006929dbf31e86731bb049fc89f5e8a74a69eceb9fce989364d3529b9
font_01_sfnt_off00016858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16858 11692 bytes
SHA-256: 5952db1dcdc19a54f1cec51e2886e68910f71cb02d7fdde0d429ab7655ccc840

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