Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93ba51ff15882d6…

MALICIOUS

PDF

94.4 KB Created: 2020-12-25 13:55:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 827684ee7bcef3bd421b06983530dc83 SHA-1: 0359ad1bce80e968b274a46d2c5e478991148284 SHA-256: d93ba51ff15882d6a56d97118ba67467cac19351fdb5daaaa4f391c370fe83cd
214 Risk Score

Malware Insights

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

The PDF file contains numerous links to other PDF documents, a technique often used for SEO poisoning or to host phishing content. One of the embedded URLs, 'https://cctraff.ru/strik?utm_term=king%2527+s+raid+plug+th', is flagged as a known malicious redirector. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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/strik?utm_term=king%2527+s+raid+plug+th In PDF document text
    • https://static.s123-cdn-static.com/uploads/4457279/normal_5fdcf1767b765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385852/normal_5faf9e97076f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391620/normal_5fb57ada3901f.pdfIn PDF document text
    • https://delutezebojuk.weebly.com/uploads/1/3/4/3/134353455/bokudiwakagipoj-ririmaroxiw-kelobasejobo-foriw.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/XjgWGGQ/59765945713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_5f9948aa60884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489035/normal_5fd89926267e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404313/normal_5fd6752076fba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d65f087d-8409-4a2d-910b-ced59e120638/suit_measuring_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/623ccf5c-459a-4aad-8eae-2c2ef5756d92/mimupedojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c51983-c5e4-4f27-9066-f1670416454f/napokugunotabapakajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e3871cc-cf54-444f-8f44-5c33c275dc13/14748833787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6128c199-1292-4108-8d59-3c19a9e51c3e/carboxylic_acid_vs_ketone.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D1 6476 bytes
SHA-256: 51ab6905290750564d90708e7631dedb146f5386d6918388d3b3373a2b20f6d9
font_01_sfnt_off0000d8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A6 2916 bytes
SHA-256: 6a0b1e745b39e736745c76ac19cd27c13ca49497f3712b9d6e900480561b6c6c
font_02_sfnt_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 5224 bytes
SHA-256: 512cf43689a6ba38acacb04e7a2eb8eb59089bdd970e7ed1b82d75e4eb791c94
font_03_sfnt_off0000f495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 6340 bytes
SHA-256: 58765afbf79dfac18aa2be5657ba4048cf3b195f9206c7e7e4c9fcdb971a68cd
font_04_sfnt_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 9832 bytes
SHA-256: 80697e4a4bf8f9b332aebeba18120f530f8dd45d8b944bb57d8c031e38c391d7
font_05_sfnt_off00012594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12594 10592 bytes
SHA-256: 709e60602b304a44c6199027b633ae14dc12799fcd3a9464658bdd719c46ce5b
font_06_sfnt_off00014a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1E 19712 bytes
SHA-256: 5a7de5e5a2b8ab9cf3e9a46f33a12901340084848585c05994895cf2cad491a5