Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c24bc19bd023c6e…

MALICIOUS

PDF

79.3 KB Created: 2021-03-05 04:46:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 50405b1514e1da1dbf7f25e1559323ea SHA-1: 90fcc5b83ac6d64910b26b55f22c15495a54293b SHA-256: 9c24bc19bd023c6e3f23bfe3e097cb7df5f271e2f599e0ded2a19ae793e85053
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bologen.ru/123?utm_term=how+to+replace+pool+valve+actuator PDF link annotation
    • http://midarujiwuvi.mygamesonline.org/71799152724.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvitatutuv/yijifii/86007472222.pdfIn PDF document text
    • http://stavki.link/sign_of_the_chrysanthemum_summary03oet.pdfIn PDF document text
    • http://wowit.pro/crunchyroll_online_store_coupon6cgyr.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/how_to_install_universal_steering_wheel_control_interface.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423195/normal_6003e45d85561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_603fb675171a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_601ddede2694b.pdfIn PDF document text
    • https://cdn.sqhk.co/sifilefu/NjiXhf2/subway_surfers_promo_codes_that_work.pdfIn PDF document text
    • http://8bitbeardsco.com/onkyo_tx_nr809_manualk4ynn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454665/normal_5fd7c1cb0cc26.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/hejierC/69069726802.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/noxulokifabupyc7zx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_60419513a6594.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475863/normal_5fef43ad3b4a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388619/normal_5ffc4716e4a9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452161/normal_602c85d292151.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_d2917868a0ee448d8ccdd81ae9b9d8db.pdf?index=trueIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_cc6b447c188247d0bea6354e16daeae3.pdf?index=trueIn PDF document text
    • http://zitulogakapede.myartsonline.com/how_can_i_tell_if_my_furnace_has_a_pilot_light.pdfIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_bfd504790c92427d9d0270de05f57d22.pdf?index=trueIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_56128cc6ff01404a8ad8e7cda00d8166.pdf?index=trueIn PDF document text
    • http://tiwatimab.atwebpages.com/9113291305.pdfIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_17c3b9edfe0449179c8d447870fae998.pdf?index=trueIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB69 4860 bytes
SHA-256: 027b05d82e1592c4f38840b9ab24814c4aa53b078ca238f7df5599bbf1881e2f
font_01_sfnt_off00010c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C15 10408 bytes
SHA-256: 44a22fd86ff3202b30952a194b23700084ef7d28130c7d081101f6a5ff615a19

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