Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ed01648a26b5d7…

MALICIOUS

PDF

84.3 KB Created: 2021-03-17 20:56:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fbac02c8b59b4871a88ed2618af67a2c SHA-1: a68c521715f2de94e09afe7dff94ab5cc97b21a6 SHA-256: 23ed01648a26b5d7a50714ab37062a6b0f95f059ff2d67631a59ba61dda18836
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO spam campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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.
  • 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://zajinet.ru/wix?keyword=give+up+1 PDF link annotation
    • https://perikoweb.weebly.com/uploads/1/3/5/2/135297066/fajosuvarokib.pdfIn PDF document text
    • http://mizafaroremida.getenjoyment.net/pdf_editor_delete_text_online.pdfIn PDF document text
    • http://zujewubowufonug.scienceontheweb.net/ignou_solved_assignment_2020_19_download.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/juzobawepodogivemometuxi.pdfIn PDF document text
    • https://genebametujo.weebly.com/uploads/1/3/4/9/134904617/5851431.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/fijatawititakedetuvufamin.pdfIn PDF document text
    • http://runmasten.online/komipeligobabalanub3l82u.pdfIn PDF document text
    • http://podarokinsta365.site/jiwulenilpb.pdfIn PDF document text
    • https://kuxafedileveniv.weebly.com/uploads/1/3/1/0/131070371/9935178.pdfIn PDF document text
    • https://pekonupag.weebly.com/uploads/1/3/2/7/132741447/2703021.pdfIn PDF document text
    • http://musc-media.xyz/how_many_degrees_between_the_tropic_of_cancer_and_capricornf8o09.pdfIn PDF document text
    • http://tradebot.space/curso_saboaria_natural_cold_processpt6q2.pdfIn PDF document text
    • http://kmikaerfs.ru/what_is_the_best_solar_security_lightvhq04.pdfIn PDF document text
    • http://aduo5.online/broken_heart_sad_pictures6fci3.pdfIn PDF document text
    • http://afracheat9.xyz/making_movies_sidney_lumet_freeew001.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/likerajatob/terminal_emulator_for_laptop.pdfIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_0900ac96d52242bc8ab4d3cf15a2c4c3.pdf?index=trueIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_4e1c987438d14635a438486488fb49b7.pdf?index=trueIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_5e8f50c6c0cd4007a9106aaea7430b02.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/wukiwi.pdfIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_80e0092b63294824ae0db2a62b179116.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2C 15504 bytes
SHA-256: 17e77092b0ecd73f6a8037a035edb2ef560501ef6f419dae192bb1a24e9e3076
font_01_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 4440 bytes
SHA-256: b4a85205d5de9f2784ca2650d600ba8a8b0b0a893cedad13739ca964855f8454
font_02_sfnt_off00011d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D24 10872 bytes
SHA-256: 2a5d781d4f6816eaf341847bcb7b62a1cff93a3ea954595886cc7d34ae346940