Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b1670c7d22e1d9…

MALICIOUS

PDF

72.7 KB Created: 2021-03-13 16:28:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: deb6ba836613bde9712110706e892b62 SHA-1: f5d6a4e99a657f0c8d20925c0f212d737a84d934 SHA-256: 87b1670c7d22e1d94ad5ed830b34041bb88fa1c9d6c42f2ed1bc20236db62b43
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to potentially malicious websites. The primary suspicious URL identified is https://seumenha.ru/wix?keyword=ff14+suzaku+ex+guide+deutsch, which is likely used for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9576

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://seumenha.ru/wix?keyword=ff14+suzaku+ex+guide+deutsch
    • https://revuduxaj.weebly.com/uploads/1/3/5/3/135333309/xadutoj.pdf
    • https://kawapojironene.weebly.com/uploads/1/3/1/6/131637385/94443.pdf
    • https://toginomaba.weebly.com/uploads/1/3/4/0/134042469/lodasarul.pdf
    • https://ginufadep.weebly.com/uploads/1/3/4/6/134668932/a7add1419.pdf
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/9969131.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/84614bb0-4a98-485f-a9b7-f759424b5a81/67163192418.pdf
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_38b7af15ca4a4ebc8bbd40584c774105.pdf?index=true
    • https://uploads.strikinglycdn.com/files/07f1b145-e973-438b-9455-7ccb03bc2dd1/nikamovabulidijoxufadomu.pdf
    • https://uploads.strikinglycdn.com/files/21647b83-baa8-4af5-bf11-dfc812394156/you_are_the_universe_experiencing_itself_quote.pdf
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_ae8ba54e53604427bc8c0e221390a44c.pdf?index=true
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_a105a22771454e669896aac1a8279511.pdf?index=true
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_d74fa1db668a483e8de37b0b01b702d6.pdf?index=true
    • https://ae9cd3fc-a2ed-4114-aa96-dd53a7e96ab4.filesusr.com/ugd/22cbe6_1233a1d205f34142b5ce33f88efff156.pdf?index=true
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_935921083d07449e8bc8219a45d1b87f.pdf?index=true
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_d8e8e83b1aa64d2b8c21c30feac078d9.pdf?index=true
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_3af7ef29a60f4076835a396db8e7ff8b.pdf?index=true
    • https://s3.amazonaws.com/tolivajupeku/73856378219.pdf
    • https://uploads.strikinglycdn.com/files/14d92bd7-50e5-4ac6-8836-3e5bbdddf9a2/sherlock_holmes_short_story_collections.pdf
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_598e1684d1364fc5b00730735e8ebc3f.pdf?index=true
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_a5e781d615314480b516e9f24317b74c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5da140e4-1afb-49c0-993d-bce6f52778a8/dell_e207wfp_monitor_specs.pdf
    • https://s3.amazonaws.com/bejokazemur/iphone_icloud_unlocker_tool.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107bd.bin
3f31e97cd452ada88282446087cfe887a3407b499488c9a94316f94bd659d422		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107BD 5432 bytes

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