Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e5c1e6eec7a574…

MALICIOUS

PDF

75.8 KB Created: 2021-05-06 18:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4e4a16095f3d96608e189156334d7112 SHA-1: 2bb1763f4adc0152da08eca5684dd66c179d8e3e SHA-256: 76e5c1e6eec7a5745d75a28294d437c2b13b0582c9907915d5ba47a0a6b0a414
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://xajibur.ru/strik?utm_term=java+8+jdk+download+linux PDF link annotation
    • http://nukels.xyz/romimelosofunev4j8h.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/35841866791.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/causative_mixed_tenses_exercises.pdfIn PDF document text
    • http://choosemadam.site/forgot_schlage_master_codeywqaj.pdfIn PDF document text
    • http://betflixguvenilirmi.com/ladukewivoridewecivv.pdfIn PDF document text
    • http://vobafoselalulor.mypressonline.com/45614690365.pdfIn PDF document text
    • http://namedaun.fun/the_education_of_little_tree_movie_online_free2qn5u.pdfIn PDF document text
    • https://cdn.sqhk.co/duvetezoje/g7OKjiB/poredosunizoledar.pdfIn PDF document text
    • https://cdn.sqhk.co/fumodolanes/agcLja1/ludoviximonojomajanitupoz.pdfIn PDF document text
    • http://myfirstsite.xyz/2833773282mf2gv.pdfIn PDF document text
    • http://sutezesibopixiv.medianewsonline.com/avalon_hill_civilization_rules.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/argus_software_for_pharmacovigilance.pdfIn PDF document text
    • http://zomolejefej.mywebcommunity.org/62472476992.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7d7cd0c-8b65-4ed2-a0e7-1096cdbe5bf3/461_stihl_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37719594-8b29-4ed1-8f0d-3797a44e6066/nixon_the_sentry_battery_size.pdfIn PDF document text
    • http://megigezorozo.atwebpages.com/que_es_una_ostomia.pdfIn PDF document text
    • http://mepitar.atwebpages.com/velalisiniju.pdfIn PDF document text
    • http://bavevex.onlinewebshop.net/phonetics_dictionary_free_download.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_off0000e931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 5088 bytes
SHA-256: cf43a64c97a12882baa415cecd9a25cc57cd7f9f130b2c2bca2d95b8e175b11c
font_01_sfnt_off0000fab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB6 11076 bytes
SHA-256: c925a87205971c1e0298b75104c29467e6e166564f8b9087fb8df6ca5b9a0747

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