Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45ee43e1c735af3…

MALICIOUS

PDF

95.1 KB Created: 2021-03-25 09:30:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60aacb38177458353de1a7cb246e089e SHA-1: 2f01060cbc070c67af5db94056c1e22b460eb3c6 SHA-256: a45ee43e1c735af38dfb7feae4d507c330dce82e937e6fdad678ee0ff7e07ca3
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. Notably, the document includes a 'Clipboard command execution lure,' instructing the user to copy and paste content into a shell, which is a common technique for executing malicious commands or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=mapa+tren+cercanias+madrid+pdf
    • http://pozuvixa.getenjoyment.net/30451035968.pdf
    • http://puliliraforuwu.22web.org/love_breakup_tamil_images.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_a34c37a23d1f4c49b7aa871062484d96.pdf?index=true
    • https://be5a03d2-cb36-429a-bb4d-4773f067dd3b.filesusr.com/ugd/b46ca8_6c82b3cddfa143a3b84d7cb7262e164e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/39497ea8-3344-43a8-922f-39d4efcc58cd/gordon_ramsay_ultimate_cookery_course_pork_chop.pdf
    • http://vojutomozab.epizy.com/definicion_de_energia_hidraulica.pdf
    • http://rapuwovire.rf.gd/xafevubumutafozutopenil.pdf
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_edbb31e15cdb44e5b443c532823e9a34.pdf?index=true
    • http://wodowepakimeko.onlinewebshop.net/sch_shadowing_ting_nht.pdf
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_90e6711312ca408681f82191e125e8d4.pdf?index=true
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_61febfca8d844321a61d2a44b5069880.pdf?index=true
    • http://zapusov.atwebpages.com/meserukidigumawuku.pdf
    • https://uploads.strikinglycdn.com/files/0638cf50-1127-45bb-9539-efa4170526a6/53486286757.pdf
    • http://pajupevezujugut.atwebpages.com/wire_gauge_current_rating.pdf
    • http://zesugipove.onlinewebshop.net/grade_12_biology_textbook_download.pdf
    • http://saxodanokijaj.atwebpages.com/how_do_i_fix_my_nextbook_tablet.pdf
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_3b82272e16cf4029aa1861b14b9b256e.pdf?index=true
    • 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_off00013114.bin
7d5b72176fa25bbd04831c59b98d879b0e116db39b91562ec7a8d0c22b3c973a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13114 5276 bytes
font_01_sfnt_off000142f9.bin
52a34d7576201490f25eb0076eae2e0102b9e0926bb3b660066e10ed1bd1bb5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142F9 14140 bytes

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