Malicious PDF — malware analysis report

Static analysis result for SHA-256 9282e53b72cd33c2…

MALICIOUS

PDF

75.0 KB Created: 2021-04-01 10:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c883c17b95a0c1c42a381c29b16c418d SHA-1: 51567c3c845e4d11894ed1aee385cbdc41082058 SHA-256: 9282e53b72cd33c239d32d0e06d4cba1f52de58c1e60b7ca2d532fa7dca0214f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for distributing malicious content or phishing for credentials. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to create a link farm. ClamAV detection and ML classification confirm the malicious nature of the file. While no scripts were explicitly extracted, the presence of external URLs points towards a downloader or redirector functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://golowaki.ru/award?keyword=dips+academy+abstract+algebra+notes+pdf
    • https://cdn.sqhk.co/mixubiki/bBifvzK/hearts_of_iron_sabaton_wiki.pdf
    • https://cdn.sqhk.co/bepotedaxus/V0dkRTH/free_joy_cross_stitch_patterns.pdf
    • http://xawamiwupajev.mygamesonline.org/the_lion_the_witch_and_the_wardrobe_full_movie_cast.pdf
    • https://cdn.sqhk.co/donuvoduvedo/cheiegd/43836194500.pdf
    • https://cdn-cms.f-static.net/uploads/4403408/normal_604db926abde8.pdf
    • http://bidetoluji.getenjoyment.net/nexus_agile_framework.pdf
    • https://cdn.sqhk.co/zudusidesu/UhfUaia/lopufat.pdf
    • https://cdn.sqhk.co/murafabu/ihjchha/58160770162.pdf
    • https://cdn-cms.f-static.net/uploads/4374685/normal_60116238a1065.pdf
    • http://lixodamevurobar.mygamesonline.org/the_little_book_of_hygge_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/34e1882e-2b5d-4b53-a34e-c4c87f3cb5e9/47469987488.pdf
    • https://uploads.strikinglycdn.com/files/d16fe82c-61ac-40ad-8d71-fd300943b5f9/does_logitech_webcam_work_with_mac.pdf
    • https://a79c6309-487e-499f-a993-0ac454a400c8.filesusr.com/ugd/747acf_9c5450cd3b8043b9ae1ffe9cb477c5db.pdf?index=true
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_1ae44bae2d084ee08628aa85b05dda60.pdf?index=true
    • http://salajire.onlinewebshop.net/62545323402.pdf
    • http://lojibovel.myartsonline.com/minn_kota_i_pilot_link_upgrade.pdf
    • http://zazupixuwup.rf.gd/62629116481.pdf
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_03abfd7a6e9049eca245955d1f3b2078.pdf?index=true
    • http://rikonuge.rf.gd/cooking_chicken_wings_in_power_pressure_cooker_xl.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0da.bin
bbed88a449150e4663ef8d596111358f2a4c0594887f5f16e09be3651b739c14
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 5716 bytes
font_01_sfnt_off0001043e.bin
0c4c8c0848c91e0bb2786b059dfbfced91680622fc1bfe4c6797f2caaef6a1c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1043E 10724 bytes