Malicious PDF — malware analysis report

Static analysis result for SHA-256 5390898b8198d5c0…

MALICIOUS

PDF

74.6 KB Created: 2020-12-20 13:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: fab6b3c8ae75b770b95aa924238826f4 SHA-1: 925c51526b5e2b6b270f7295ad59bf2e2285170e SHA-256: 5390898b8198d5c016c43a7747b3248bc7a28a22e5c24354a346a9c808a23a08
222 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, routes users through malicious redirector infrastructure 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 0.9998

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
  • 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.
  • 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
  • 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://traffmen.ru/strik?utm_term=jcps+smart+express In PDF document text
    • https://tebixuku.weebly.com/uploads/1/3/4/5/134595315/bijenuxel.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/5fc570c5104edf1d779fad1f/t/5fc849da26a3037b43368de7/1606961627763/blade_of_god_vargr_souls_gift_code.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c8f51452f90b7fe4c8fc/t/5fc171fc9d79364840c41e4f/1606513148750/ffxiv_materia_concerns.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/bet365._gr_mobile_app__android.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf686a2dd96f5918e741e3/1606379628030/city_green_book_summary.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce32c08785af7abc630ca2/t/5fd6446c72b1137fa971d392/1607877753988/australian_dietary_guidelines_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/309a5511-cbf0-41b2-acc3-c8463bf9aa96/51812352863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f1779e7-11ca-439f-98df-d878804c84f7/duval_high_school_wv.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6adf70a2757459b0b604b/t/5fc9c4c2d7c3040d8730e9d6/1607058627995/quotes_funny_memes_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ad647b1-558a-491c-bf2c-a03237824300/mario_adventure_2_online.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc7d42ec98190d8a5337c0/t/5fdcc4a5354b8b0b882b511d/1608303782912/free_powerpoint_animated_video_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21db375a-591e-4f89-a7d9-b4f0b11b6458/true_colors_test.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc65d205bcb0228a2a7d3ce/t/5fce6d6016f08a3b94bdfd50/1607363937819/craftopia_multiplayer_issues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bb7e982-571e-48cc-a1f0-de4d6652feb1/jawedek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e4a49bd-3e7f-48ab-9946-09ef2bfbf10b/bexikupurevolikokop.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07B 5104 bytes
SHA-256: a56bd0119a6738aa228ffdd6a66848c0e8e703c173ed0a05a89692b469ad03d6
font_01_sfnt_off0000e1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BF 11384 bytes
SHA-256: b45ef8660264e001bad17ffd48f42bbf84546a32d39eb75527c2df50105068ab
font_02_sfnt_off000108c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C7 16088 bytes
SHA-256: eb7b4b228fafcef107a4e5542544117d515d0376ab8a93d2f3122d85c7f660ea