Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae47985e9a7e606…

MALICIOUS

PDF

71.9 KB Created: 2020-12-15 23:11:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b7acf1a3b9ad33e0f885e64dbc7a9020 SHA-1: 90adb014212b6850b95f974b357daed166076653 SHA-256: 6ae47985e9a7e606592db83b8fd9436554c19f3dc1feef780613b3ce4bd8227b
194 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses an invoice-themed lure. 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 0.9997

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafficel.ru/123?utm_term=parts+of+a+cruise+ship PDF link annotation
    • https://siwikuzovusodig.weebly.com/uploads/1/3/4/3/134357046/f3f28bf62f.pdfIn PDF document text
    • https://suxobotomifupol.weebly.com/uploads/1/3/4/4/134445318/tiwejesodezinurabemu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390681/normal_5f9e1b1d15429.pdfIn PDF document text
    • https://zurozudosumo.weebly.com/uploads/1/3/4/7/134719863/5a3a97fac0381.pdfIn PDF document text
    • https://kurajefofukagi.weebly.com/uploads/1/3/4/8/134895289/2193732.pdfIn PDF document text
    • https://vujofuda.weebly.com/uploads/1/3/4/3/134375628/3243415.pdfIn PDF document text
    • https://lakalenavis.weebly.com/uploads/1/3/4/3/134313358/523914.pdfIn PDF document text
    • https://gobisenuginofaz.weebly.com/uploads/1/3/4/4/134490447/8162912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381997/normal_5f9b5cf3b75c6.pdfIn PDF document text
    • https://sekatuxu.weebly.com/uploads/1/3/4/8/134894727/2593337.pdfIn PDF document text
    • https://lifitexuga.weebly.com/uploads/1/3/4/3/134356919/nirisi.pdfIn PDF document text
    • https://ninisajata.weebly.com/uploads/1/3/4/8/134869212/8913154.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0f66f116eb00e3c4c456d/t/5fc66bb3a97599144ed581bb/1606839220277/cartoon_craft_minecraft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e554a938-49c8-40a3-8637-7bcbb928f9cb/lovepedal_kalamazoo_schematic.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_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 5072 bytes
SHA-256: 3e889c54c77999d87be9c24a99759b82309365cd2d5eb631edcbc300a3e58eb8
font_01_sfnt_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 10380 bytes
SHA-256: e00eef673dfdb5b1c59e38eeac27380ff3845c3089a7539cb52522646c1fd333

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