Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9424bfe64902c3c…

MALICIOUS

PDF

65.6 KB Created: 2021-05-23 06:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68f0083dde5106525d6833c175aef160 SHA-1: c39223519ca9cb9fdbd2cf514444849826b5b9bb SHA-256: d9424bfe64902c3c32146c2a4c412d9a10397a09971b56a2e67750b454e0dd57
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to seemingly benign PDF files, but one critical link to 'baarspo.ru' is flagged as suspicious and likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8274

Heuristics 4

  • 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
  • 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://baarspo.ru/strik?utm_term=how+to+fill+out+form+ssa-1099
    • https://vozabamoz.weebly.com/uploads/1/3/5/9/135959881/gugutidawosomo_birutineraniwo_sozexazozim.pdf
    • https://cdn-cms.f-static.net/uploads/4483083/normal_6019b4ecd65cb.pdf
    • https://static.s123-cdn-static.com/uploads/4476582/normal_5fc5db898b1b4.pdf
    • https://cdn-cms.f-static.net/uploads/4484805/normal_602dd550d71ec.pdf
    • https://cdn-cms.f-static.net/uploads/4413469/normal_5fd12a1a83bf9.pdf
    • https://buketopol.weebly.com/uploads/1/3/4/0/134013372/23315b8.pdf
    • https://mixuvuweti.weebly.com/uploads/1/3/1/4/131483588/1157831.pdf
    • https://rawekawus.weebly.com/uploads/1/3/4/4/134467784/mevivufob_lisivasaxus_debutuzexe.pdf
    • https://fojexoduzasob.weebly.com/uploads/1/3/4/6/134693365/gutusexufutuvo-bowevogipetoji.pdf
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/6560d790d6a97.pdf
    • https://wezoduvum.weebly.com/uploads/1/3/4/0/134096245/134cdb6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/00b4f248-8656-4b27-85ae-83750863d41d/bodybuilding_anatomy_book.pdf
    • https://uploads.strikinglycdn.com/files/938ab879-baa3-4880-b4c1-5765ce51b0d5/tabe_test_practice.pdf
    • https://uploads.strikinglycdn.com/files/22ec7b3c-74ec-40a1-8522-96414114f55b/xukari.pdf
    • https://uploads.strikinglycdn.com/files/c0525070-65f9-464f-9ad6-f631560cf27f/truist_bank_locations_in_ohio.pdf
    • https://uploads.strikinglycdn.com/files/1c0b87d5-ba73-4984-8676-b7e373188b34/wakefatikupaburulumopi.pdf
    • https://s3.amazonaws.com/xulepiwa/mysql_for_mac_os_x_free_download.pdf
    • https://uploads.strikinglycdn.com/files/849dea41-4c90-4d94-9e31-614942af9ebe/paulo_coelho_libros_veronika_decide_morir.pdf
    • https://uploads.strikinglycdn.com/files/a59fa252-49cd-4d95-b6e9-e4d864285036/kenmore_ac_unit_not_cooling.pdf
    • https://s3.amazonaws.com/jolozidabi/22529195600.pdf
    • https://uploads.strikinglycdn.com/files/ed05f534-f6a7-4d5b-ada2-728c5e4923b0/nutinitamewunatibulidugam.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d7.bin
193a68e8bb75a656b1f6a205cdc72486a72cd9c8da875e96a0e552af0367e546
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 5348 bytes