Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa42eae5fb42d376…

MALICIOUS

PDF

78.3 KB Created: 2021-04-05 04:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: db38c71238e45ef93943aea10cefa281 SHA-1: 7fb20c8d2ed3009b3a707139f6e8b77bc9ac562f SHA-256: aa42eae5fb42d376ec61693be0e10464087c9e7bd193e951dd516510980c7cc9
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and redirector infrastructure, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the malicious redirection via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=ocr+a+level+computer+science+revision+guide+pdf In PDF document text
    • http://jixusigelabewe.iblogger.org/how_to_set_call_forwarding_in_samsung_a30.pdfIn PDF document text
    • http://creditscoretracking.info/659426005009fo8x.pdfIn PDF document text
    • http://it50discount.pro/pokemon_crystal_clear_complete_downloadghml4.pdfIn PDF document text
    • http://diwokaxojizo.iblogger.org/hamilton_beach_rice_cooking_instructions.pdfIn PDF document text
    • http://linogozajasupe.22web.org/order_of_operations_integers_worksheet.pdfIn PDF document text
    • http://watenaz.iblogger.org/base64_string_to_html.pdfIn PDF document text
    • http://trenketo.buzz/82521568417h810g.pdfIn PDF document text
    • http://afracheat6.xyz/7760652610jsoqy.pdfIn PDF document text
    • http://telemprom.xyz/xiwoxuva7yvz7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6ef11556-d903-4c9b-bff8-3b7b6049fb18/getojemibifalipiguxukugir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f69a2ff3-6058-4352-8803-42bf17bbbb21/safetuzuxalede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b470e396-5fcf-49e3-8887-507031fa4956/vezobixipugum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc43237d-012a-4ef6-b292-a8c604198ab6/zenotazutan.pdfIn PDF document text
    • http://muvebabivixa.rf.gd/sifemixaranumiduzofujagab.pdfIn PDF document text
    • http://tarefipiv.rf.gd/vinakoborulevabefi.pdfIn PDF document text
    • http://tijiwef.epizy.com/ages_and_stages_9_months.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/755e304f-152f-4777-9b2c-3a2615dad46b/beautiful_disaster_lyrics_meaning.pdfIn PDF document text
    • http://mijuguxugatuk.epizy.com/boporujadurotak.pdfIn PDF document text
    • http://nojisibi.rf.gd/kenugozamupigapalan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/538e216b-b98c-4d21-8ad0-20f355f7ca5f/what_is_the_wavelength_range_of_uv_spectrum_of_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f58534d-a7e0-457e-81a7-89d409980ccb/is_a_15_dollar_tip_good.pdfIn PDF document text
    • http://vupiwur.rf.gd/46959908616.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36B 5444 bytes
SHA-256: c53d2caa564a3585e8561347ec03157405eb6065ca3ba6f9582c00a573c69d4c
font_01_sfnt_off0000f5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DC 11176 bytes
SHA-256: ccb5bb85dd735b3f5be8819fa9c583917a6f53ebc1b640d915878bc4d6bc2631
font_02_sfnt_off00011ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA4 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2