Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacce5e6e77bf8d0…

MALICIOUS

PDF

74.9 KB Created: 2021-05-16 12:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cb03b3bc68a99bdbbe8ee6d0aaf280de SHA-1: af8169f528f4fa0bf86084df04b5787d7515db1a SHA-256: dacce5e6e77bf8d0c251855146b5f1beb29cb861821da46f9634e2a962687418
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. One prominent URL, 'https://xezojetit.ru/strik?utm_term=how+to+teach+main+idea+to+first+graders', is directly linked to the document's apparent content, indicating a targeted attack. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xezojetit.ru/strik?utm_term=how+to+teach+main+idea+to+first+graders PDF link annotation
    • http://xuzerujagojagip.scienceontheweb.net/gefumuvafosodirovebalasa.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/temixubaxajejibevidofaic6ov.pdfIn PDF document text
    • http://gonalotuturopil.mywebcommunity.org/gaxukijafileg.pdfIn PDF document text
    • http://resokipuga.getenjoyment.net/bohemian_rhapsody_notes_piano.pdfIn PDF document text
    • http://wudenufodoroziv.scienceontheweb.net/list_of_important_days_in.pdfIn PDF document text
    • http://alcexpress3.xyz/guxiretow6do4o.pdfIn PDF document text
    • http://terakusinuw.mypressonline.com/food_list_for_diabetics_type_2.pdfIn PDF document text
    • https://xibopenevitamog.weebly.com/uploads/1/3/4/4/134488628/gewejigapu-fiditivoni-jowubuma.pdfIn PDF document text
    • http://wedurorokim.mypressonline.com/nelobakedusa.pdfIn PDF document text
    • https://texotawumixiwaw.weebly.com/uploads/1/3/4/8/134898612/fuzix.pdfIn PDF document text
    • http://mebevevi.mywebcommunity.org/21692277186.pdfIn PDF document text
    • https://vevenefokuje.weebly.com/uploads/1/3/0/7/130775565/a451dbdb3069b7e.pdfIn PDF document text
    • http://larokamexi.sportsontheweb.net/81937191673.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/tumuzu/88609137187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acfff529-24da-4ee8-9ab8-10755715bc87/gonetunigiganiwuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb1b5978-5d9d-48cf-a5c7-bed402531f9b/38694015416.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/xigegidazavexapazusetax.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 5456 bytes
SHA-256: 596e438fa52aa40288c02f2ca5878bc340b5062380dbe5a85869497e36d0ce95
font_01_sfnt_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 10776 bytes
SHA-256: 8d3b75179df21570e809f773c04ca24c9222121b1240986cde308abe649f6c62

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