Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a8710e12fd6f69…

MALICIOUS

PDF

131.8 KB Created: 2021-03-19 05:13:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7836552cffcedc9ed1ead1938461bd90 SHA-1: b9922ba8c9221ee0ddc3a8ca6614787c2358ddc6 SHA-256: 50a8710e12fd6f69a299e2c11868d529150c6b87ce850a15492e921daf984987
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, identified as malicious by ClamAV and an ML classifier. The document body, though heavily obfuscated, suggests a lure related to 'animal tissue culture' to entice users to click the malicious link. The presence of external URIs and the overall detection by security tools indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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
  • 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://maypoin.ru/award?keyword=animal+tissue+culture+pdf
    • http://usechambre.xyz/bobcat_s650_code_m1706bwdcx.pdf
    • http://trylait.club/ubuntu_12._04_lts_desktop_isoldumz.pdf
    • http://xuxetosufuzo.getenjoyment.net/anemia_drepanocitica_pediatria.pdf
    • http://reznitskygallery.com/35000794786yanqe.pdf
    • https://cdn.sqhk.co/dozelodet/gjaigfi/clash_of_clans_for_dell_laptop.pdf
    • https://cdn.sqhk.co/lazuxorus/egcjdG5/asymptote_worksheet.pdf
    • http://pycnidwzxc.info/1080036258526uxs.pdf
    • https://cdn.sqhk.co/dojaxeje/hhjhhig/archery_adventure_games.pdf
    • https://cdn.sqhk.co/fixefalid/ih5iaja/joximetapajasarepefofima.pdf
    • http://cosmicgig.com/dino_grand_city_simulator_apk6x5vc.pdf
    • http://donbetosstreettacos.com/the_new_adventures_of_winnie_the_pooh_vhs_uk6xo5d.pdf
    • http://pubggaming.online/farelubmgpeo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ecb504c4-3671-4483-93ae-63fa8ca0b3ae/how_much_do_python_programmers_make.pdf
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_54e92a6bb663449aafb9fb14cb2d7f33.pdf?index=true
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_7e1136ae72bd40c1bb4acd839a0382d6.pdf?index=true
    • https://dcd55a6f-f4d9-4ab7-9ea0-0dac4ffa5d6f.filesusr.com/ugd/f7cbe4_d36ef4114e8c4131930c432668b1b31d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4fb76c38-8f89-410b-8cee-c44eea47f320/bontrager_node_2.1_for_sale.pdf
    • http://niwimugosaz.onlinewebshop.net/home_design_apps_for_iphone_free.pdf
    • https://uploads.strikinglycdn.com/files/c8139bf6-413c-4db8-8432-88ba839e068f/rigavobaridatazefe.pdf
    • https://uploads.strikinglycdn.com/files/1242348e-6574-4c18-801b-3dbe201e5ac6/21372853632.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c7e6.bin
a612f5c91574d0808d55094672126a48f96b27c5bb45e2c94a7e43ff3d97c037
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7E6 5288 bytes
font_01_sfnt_off0001d9c8.bin
7335de159b22247dc92a90c54a1fc98cb7adaba3479fda0eca41e57db1ded2a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9C8 11868 bytes