Malicious PDF — malware analysis report

Static analysis result for SHA-256 6daa19a5fb14ef88…

MALICIOUS

PDF

74.7 KB Created: 2021-04-04 02:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e43243b6d45bfc7fc1ce9b90472d809a SHA-1: fb1f32aade21a57bc90f7d53641491217c7cded7 SHA-256: 6daa19a5fb14ef8895841a99e523aad9fbf428822d89c77e2039bbc662a8fcc2
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to a suspicious domain, pelibifir.ru, which is likely used for phishing or to host a malicious payload. The PDF's content, though heavily obfuscated, suggests a lure related to 'local government budget process'. No scripts were extracted, but the presence of external URIs and the high confidence detection indicate a malicious intent, likely related to social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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/award?keyword=local+government+budget+process+pdf PDF link annotation
    • http://hamsterbig.com/empirical_probability_examples_with_solutionsr9qwq.pdfIn PDF document text
    • http://italia-doc.fun/twilight_2008_full_movie_tamil_dubbed_free_download_tamilyogifzvsy.pdfIn PDF document text
    • http://student-yurist.ru/how_to_use_iphone_for_elderlyuhw3e.pdfIn PDF document text
    • http://banquepopulaire-fr.org/behringer_xenyx_1202fx_-_12_channel_audio_mixer_with_effects_processoruhilf.pdfIn PDF document text
    • http://online-sistem.site/navujupivafabesaba6rahz.pdfIn PDF document text
    • http://eroganoficial.site/37954711983ba81t.pdfIn PDF document text
    • http://ekzo-fruit.ru/pokemon_soul_silver_egglocke_downloafu5ar.pdfIn PDF document text
    • http://itravelimpressions.com/hydraulic_bridge_school_project_reportc4huq.pdfIn PDF document text
    • http://vermono.site/perasewikasizoninamezolwlhh.pdfIn PDF document text
    • http://my-favshoph.online/tomatofomexukujugodogakujjaiiz.pdfIn PDF document text
    • http://netewe5.xyz/kafasasuluuq8kw.pdfIn PDF document text
    • http://magic-spring.com/96810036036416zg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_a95a51a2d667472da14eada3b33d0d66.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ccef2e-8706-4c87-87e1-5de50b5f7e7d/94036017414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc8ab0c-dc5e-4b4b-acf7-10f838a5a88b/dell_optiplex_9020_aio_motherboard_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/74275159894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1975ab6b-7d1e-4708-b7c9-f482afec269e/new_rules_of_lifting_supercharged_results.pdfIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_e2f1e67e6cef4679a2bf4c216d9a57ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/2013_porsche_911_carrera_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/double_sided_adhesive_sheets_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/39311657679.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/tds_challan_form_281.pdfIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_3e3cec24e6334a8d8da8b0667c601e43.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_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 5616 bytes
SHA-256: d250dcc39f3240f7a1cea31fc60c6107bae9f866c1c9d073538c8510c0961748
font_01_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 10020 bytes
SHA-256: 4e20d091344f703803e7b2d20fe4110a293d98747044bbf9872f61e98dfbd12c