Malicious PDF — malware analysis report

Static analysis result for SHA-256 969dfe375c9f13cb…

MALICIOUS

PDF

87.5 KB Created: 2021-05-10 00:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2621c7ed6a6de92ad1dfe0be6d1162f6 SHA-1: eccf8a0206f21bb876289833240f97548d4d1013 SHA-256: 969dfe375c9f13cbebffe89f7bb041629fe3b38e94ccad5e7718a44b291ccf85
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_LINK_FARM heuristic identified a large number of external links, with the primary suspicious URL being https://zajinet.ru/strik?utm_term=x+core+hunter+no+ac. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=x+core+hunter+no+ac
    • https://pirobubav.weebly.com/uploads/1/3/1/3/131380689/wawowafuli-mogova.pdf
    • https://ronuviwa.weebly.com/uploads/1/3/4/5/134587060/pelekuwib-zutowesavu-zasif-rurinesu.pdf
    • https://cdn-cms.f-static.net/uploads/4412415/normal_60649d331271e.pdf
    • https://cdn.sqhk.co/jegisizozul/iahhjbH/52527351277.pdf
    • https://cdn-cms.f-static.net/uploads/4490934/normal_6036bbe17871d.pdf
    • https://cdn.sqhk.co/kuzetuzame/Ajfhgl4/2231967412.pdf
    • https://cdn-cms.f-static.net/uploads/4496811/normal_600a4b3c9dd87.pdf
    • https://static.s123-cdn-static.com/uploads/4476443/normal_5fcb72b6a9608.pdf
    • https://cdn.sqhk.co/tukutabu/wKhehaB/data_roaming_keeps_turning_off.pdf
    • https://cdn.sqhk.co/mutuwatu/dVkibcQ/word_games_for_free_on_iphone.pdf
    • https://static.s123-cdn-static.com/uploads/4454668/normal_5fddcaeb98e12.pdf
    • https://static.s123-cdn-static.com/uploads/4409123/normal_5ff6613fb1331.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d28f1b80-9876-4028-aece-491e36266c6c/9616760891.pdf
    • https://uploads.strikinglycdn.com/files/38e3732d-bc1b-4e4d-80f3-01142ef94fab/tifezexuvoji.pdf
    • https://uploads.strikinglycdn.com/files/3bba88e1-228f-4408-bedd-a262c4243607/escort_passport_8500_x50_radar_detector_manual.pdf
    • https://uploads.strikinglycdn.com/files/a90ec12e-e6be-4572-a413-d54ac90398c4/rumi_bookstore_fremont_ca.pdf
    • https://uploads.strikinglycdn.com/files/3f55f9a7-8d51-48a4-b7bc-ff1404c5cb7d/23490063817.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f86b.bin
2ac4c3ea28408bb6df0b566979308c6dcadb0bdaafd8f3341f5290d8176431f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF86B 4488 bytes
font_01_sfnt_off0001078a.bin
072a723e22fa22ee354ff89015491cbe29850fbbaf82f6859928e391b5666bf2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 11336 bytes
font_02_sfnt_off00012e43.bin
52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E43 16036 bytes
font_03_sfnt_off000142ab.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x142AB 4324 bytes