Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78efc0aa21ad7b6…

MALICIOUS

PDF

68.0 KB Created: 2020-12-18 01:05:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 886af98392d2df7bc29ec527536888cd SHA-1: 09e7c64f5483acb6ed8e068acae5adf8b8d0f741 SHA-256: c78efc0aa21ad7b602bb76017460356a6a4dcaf0927afd30b6dc367861b072d8
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that appears to be part of a link farm. The ML classifier also strongly flagged the PDF as malicious. The embedded URL is likely intended to trick the user into downloading malware by posing as a free antivirus software, as suggested by the 'Avast antivirus free 2015 full version' keyword in the URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cctraff.ru/wb?keyword=avast%20antivirus%20free%20%202015%20full%20version In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5fbd61795ee52.pdfIn PDF document text
    • https://zozelezike.weebly.com/uploads/1/3/4/4/134434207/5505735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407302/normal_5f93243ca23db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453100/normal_5fb5b67a1aab4.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/5fc51b2f17e7202640054395/t/5fc7edd3e08c080739ad54bb/1606938069785/tv_serial_photos_star_plus.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d8d024b06a7eb3fedc56/t/5fc8531f13f8d93bf200f3b0/1606964000337/download_apk_rally_racer_dirt_mod_unlimited_money.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcdf8c1cd8500165ad3d6c4/t/5fd058db125f6a657a4adf9f/1607489755366/pogufopemebixawodozu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd2fc6c23b2b0938fbd7ef/1606234069654/interpret_division_with_fractions_lesson_8.5.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5aa440b6b03258f55d983/t/5fcdbaeb33187724c4109140/1607318252500/bugulabugivoxepi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc37eeb104edf1d779169b0/t/5fd1cdf0071bbc68802b386c/1607585264890/red_arrow_pointing_down_emoji.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_off0000cdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD0 5260 bytes
SHA-256: c5694dc6f29c25ceecd0dfe368e69a3a85b8ead9f2b0b26844c1f5bec2afb08a
font_01_sfnt_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 10276 bytes
SHA-256: a484ca9dfba5104d834c055b6000bac1bb0bc7a413b9ad2ce306b3623049eaca

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