Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3032d75b0608a67…

MALICIOUS

PDF

76.5 KB Created: 2021-02-28 04:53:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f1b0c352351d942cb182aaa77314c1d9 SHA-1: 2e1a9e683352cd30843c1f1b2b73c2d906818039 SHA-256: d3032d75b0608a672c64fd8d3e30d00805cc97ef823f13dd43ad214a7e2c4314
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/wix?keyword=a+grain+of+wheat+characters+pdf PDF link annotation
    • https://vumizopefi.weebly.com/uploads/1/3/5/3/135313358/xedewuj.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/ak6TNNL/duzavalilujudegu.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/repeletatemej.pdfIn PDF document text
    • https://gawudizilox.weebly.com/uploads/1/3/5/3/135300959/5721953.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/gf5vO4k/zerelajegi.pdfIn PDF document text
    • https://rebejudan.weebly.com/uploads/1/3/5/3/135316845/lorakomipo-wofekoxu.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/bdjh8jp/gilev.pdfIn PDF document text
    • https://lokogupata.weebly.com/uploads/1/3/5/9/135959524/6532730.pdfIn PDF document text
    • https://xaviguvugunaji.weebly.com/uploads/1/3/5/3/135313722/salotiwuwididuv-weruxube-gegubufo-gemone.pdfIn PDF document text
    • https://momobamuv.weebly.com/uploads/1/3/2/3/132302987/vetusuwutadewewa.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/pegozegi/resistance_and_resistivity_worksheet_answers.pdfIn PDF document text
    • http://namerunu.rf.gd/android_apps_google_account.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/diary_of_a_wimpy_kid_book_15_free_download.pdfIn PDF document text
    • http://nuxumejaxumem.epizy.com/butterfly_wallpaper_hd_for_android_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/22917782851.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_off0000efbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 5468 bytes
SHA-256: 25b32740855709655c69f42c6cdf3b65a881fa9ebc208cf589e4886d6857443d
font_01_sfnt_off0001026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026B 10336 bytes
SHA-256: 7425d67cb41bfa586e603a9a51b2e2e0a594ddfde6e7daed7a8b67ee126106ef

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