Malicious PDF — malware analysis report

Static analysis result for SHA-256 887911ca5eb44e71…

MALICIOUS

PDF

75.8 KB Created: 2020-12-17 01:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5768008f9d439c4eb55dac7ec5fb286e SHA-1: 27c9341d193b83a7358fb1899988e3a64032f38d SHA-256: 887911ca5eb44e71a2bc2be65da8b433b9535fdc1df00e381fb715fde8d7eeb5
172 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 urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=grindr+5.23.1+mod+apk PDF link annotation
    • https://xamudoniganotew.weebly.com/uploads/1/3/4/5/134509964/6768420.pdfIn PDF document text
    • https://nufodovepitad.weebly.com/uploads/1/3/4/7/134718778/3332104.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/5fc66076b8467722f1f92596/t/5fd1758787bef85997e3948d/1607562631756/fall_guys_guide_free_download_mac.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc65321c30a162e0c778c8f/t/5fd109013f2d783cae1552c5/1607534857804/6832175185.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2d9348ef7301f8b1d7a62/t/5fc8a52813de6e79815f7696/1606985009165/game_street_basketball_association_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58324a6b-10be-4b24-b523-59c162b9abd2/pukufojetawal.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc514788ef7301f8b2bec82/t/5fd6d72f034a586a4f557c79/1607915312028/fuxofaxa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf3eb00f7af3919d2b1b8/1606218731366/lakesaxun.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1c0b127a199023abb6e24/t/5fd1fa301693665fc7d5d9e3/1607596593529/1798257511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b85b69b6-8bc1-41fa-9edc-2ab3f7abf959/lake_st_george_maine_swimming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2eee95f-46fb-4f99-88b9-ea4cbce77dff/alpha_wars_hack_no_survey.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82E 5492 bytes
SHA-256: a4953070a8e975e5bf40dad159d0d67142649f5ce0ee70f9789dcfdc3b02cf1d
font_01_sfnt_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 1936 bytes
SHA-256: ee62af00421b0aafd102b52526ee3ed257a758ba91c46f8df0ef076ec2d5c118
font_02_sfnt_off0000e441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE441 13004 bytes
SHA-256: 7b2c764afa3718206302976720d5bcf7c79237b9a47c2799e497b39fe2d56f2f
font_03_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb

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