Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0ada8e70cac607…

MALICIOUS

PDF

70.5 KB Created: 2021-03-23 17:56:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9eae2c851a4261352c187bc14a50be46 SHA-1: 31dcd7aef9834304b1aac3f118404ef5cf5fda8c SHA-256: 2a0ada8e70cac6077566c298f3b598caec27ec297ca7b1182b9a11e58572bee3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wix?keyword=north+shore+middle+school+logo PDF link annotation
    • https://cdn.sqhk.co/fodexuxefeba/AfjfFjd/sasewulusurususanogedireg.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/GZihAji/silajobonegejenekarenitu.pdfIn PDF document text
    • https://cdn.sqhk.co/zunezafi/gifiijb/31160063305.pdfIn PDF document text
    • https://kowizonijate.weebly.com/uploads/1/3/5/9/135991151/paxadawupape.pdfIn PDF document text
    • http://sukalobuvigaz.22web.org/arrow_circle_powerpoint_template.pdfIn PDF document text
    • http://artdebug.site/304640562398gdkq.pdfIn PDF document text
    • https://cdn.sqhk.co/jakatote/jdjdihc/how_to_use_spotify_on_wear_os.pdfIn PDF document text
    • http://konujojijitezu.iblogger.org/antiarrhythmic_guidelines_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/pjjMbJb/fipurobupozivupoxutela.pdfIn PDF document text
    • https://derovidexaw.weebly.com/uploads/1/3/1/3/131382126/jevanifew-vimew.pdfIn PDF document text
    • http://saleproducts.pro/wuxopixuteri05klv.pdfIn PDF document text
    • https://dunopupusegujuz.weebly.com/uploads/1/3/4/3/134348927/nenorigobulenif.pdfIn PDF document text
    • http://pubguckazan.com/how_to_convert_word_document_to_jpeg_using_paintzn332.pdfIn PDF document text
    • https://julufima.weebly.com/uploads/1/3/4/8/134884845/fedojolopepago_disapapiwivak_nuvotolaronib_womoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bikevobo.rf.gd/big_ideas_math_integrated_mathematics_3_textbook.pdfIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_34711f7e0b6140f297948200f00e71d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gifiz/cordless_phones_with_answering_machine_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/bangla_video_album_song.pdfIn PDF document text
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_daaa5fb66fb8425fa4850fbd6c208639.pdf?index=trueIn PDF document text
    • http://kimabajakagun.epizy.com/91587129176.pdfIn PDF document text
    • http://pulejebolev.rf.gd/lukolinigepanamalibubipa.pdfIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_2bcd1dab369c4d4caf6c8b53eb3a0e26.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D4 5112 bytes
SHA-256: 425c0adf68bb435963489a95cd98ace00299d629d94050558c47a6c0c0dea0aa
font_01_sfnt_off0000e814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE814 10156 bytes
SHA-256: 9666dfb6fde0aaff5a5e6799cc653d67930fee0d26b41416f86653c7ef8916d3