Malicious PDF — malware analysis report

Static analysis result for SHA-256 de74ab9f7c255c09…

MALICIOUS

PDF

100.8 KB Created: 2021-06-05 13:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 18d1572be95aaa756bc2156573f21e71 SHA-1: f1a626cb7580a8e4a6031da89478756e349b9f24 SHA-256: de74ab9f7c255c09deacf76e41a9f97048f4f6f7420bdd19d9c45fe7dba0957a
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF contains a heuristic indicating it's a link farm, with numerous external PDF links. A critical heuristic identified a 'Clipboard command execution lure,' suggesting the document instructs users to copy and paste content into a command-line interface. This points towards an attempt to trick the user into executing malicious commands, likely to download and run a second-stage payload. The presence of external URLs, such as fokemale.ru, further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://fokemale.ru/123?utm_term=winpe+boot+disk+iso PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382209/normal_605b403e17430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379605/normal_602f1632342d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385436/normal_6056418711d07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425514/normal_6054d5a3f3490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402289/normal_604508cb70894.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463792/normal_5ff204852703a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451563/normal_5ff64db692990.pdfIn PDF document text
    • https://dezitatukuti.weebly.com/uploads/1/3/5/3/135389988/mokanozuriwurav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_5fea14fd4100a.pdfIn PDF document text
    • https://pesaladijij.weebly.com/uploads/1/3/1/3/131382382/4542930.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393641/normal_5fe53b76ea26d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456996/normal_60541d85c37d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386084/normal_5fe8b2c62bd93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416802/normal_602bd993381d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450724/normal_5fecfcf6ccffb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388163/normal_604786d912127.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481406/normal_602bdacc1ce69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_6049cb1f7b677.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381738/normal_5fec0612e7d3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467945/normal_6032a121e2272.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/086538cf-4822-4bd3-a422-b59477a27e04/ps_touch_cc_apk_download_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42daa131-dd1d-486b-a979-e6d79d41b584/kosom.pdfIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 16176 bytes
SHA-256: 7f1dbba280b8210d47ce4c2d31135ee6f047e13a1c0b588dbf3dad5c5ffd78cc
font_01_sfnt_off000134be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BE 4620 bytes
SHA-256: 9923607f6a2a2b68247148ff8113dfd0112520a62eae85316d0db71110ce4b8b
font_02_sfnt_off00014482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14482 16500 bytes
SHA-256: ad16f1451133706edb852a1b5d128dd4616441a6a8875e7c2c17c8be421aa146
font_03_sfnt_off00017747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17747 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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