Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc7cc3dd4a464fc…

MALICIOUS

PDF

88.7 KB Created: 2021-03-15 05:00:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 885bce4fd84f4bb1bee31458af84cdb0 SHA-1: bd6f36990de97f2e0cee82554f00df10248d37af SHA-256: 4dc7cc3dd4a464fc009de06e9bdac88b68b1de41952f56cd041c537a5f13d5b0
164 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to benign-looking PDF files, which is indicative of a link farm used to obscure malicious activity. The presence of a 'download button' heuristic and a critical ClamAV detection further supports a malicious classification. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lead the user to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/wix?keyword=rube+goldberg+worksheet+pdf
    • https://vumetubav.weebly.com/uploads/1/3/0/7/130776444/mutosenij.pdf
    • https://dataremidesop.weebly.com/uploads/1/3/4/6/134697992/701b3.pdf
    • https://gedibixofesona.weebly.com/uploads/1/3/4/6/134688069/9747531.pdf
    • https://rikodagipavas.weebly.com/uploads/1/3/4/3/134334006/299b6056d057869.pdf
    • http://zirosax.iblogger.org/xupug.pdf
    • https://cdn.sqhk.co/xedogigiloli/gfhbeQP/break_up_shayri.pdf
    • https://cdn.sqhk.co/xuwisagilevi/hdFOjdo/rerasopem.pdf
    • http://vizenam.medianewsonline.com/lisafu.pdf
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/26e52546c7df96.pdf
    • https://cdn.sqhk.co/mapiwoda/wT5jagi/sample_music_mp3_file_download.pdf
    • https://tobosuxonekid.weebly.com/uploads/1/3/4/4/134493818/lilewit.pdf
    • http://zozitaze.mypressonline.com/road_traffic_accident_definition.pdf
    • https://gutamunimidujad.weebly.com/uploads/1/3/4/6/134667749/cb827491.pdf
    • https://pebawozo.weebly.com/uploads/1/3/4/8/134865175/tidanudefomala.pdf
    • http://vobigabifinu.22web.org/engineering_technical_report_example_doc.pdf
    • http://tefitagesev.mypressonline.com/tolijozukunavu.pdf
    • http://jukejed.mypressonline.com/lend_vs_borrow_exercises.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zorijefugixor.atwebpages.com/astable_multivibrator_practical.pdf
    • http://gokonef.epizy.com/xifitetatobet.pdf
    • http://zawofepak.epizy.com/zareginegiti.pdf
    • http://zajegugolex.epizy.com/alhambra_guitar_music_sheet.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010647.bin
eebc241cb04415d3b645929b5da25fb14312a214381335a591d0c9aa03d3a47e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 5396 bytes
font_01_sfnt_off000118b1.bin
39ce1bf893644d6e67141e518fca29a3896569ac70655f81a9131e7110492d5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118B1 11820 bytes
font_02_sfnt_off000140a5.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140A5 16092 bytes

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