Malicious PDF — malware analysis report

Static analysis result for SHA-256 556eac54996c563a…

MALICIOUS

PDF

80.8 KB Created: 2021-03-31 05:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c86073843d420739f0d96e35c7ad787c SHA-1: 536e4618adeae810dccc6b2f3e1ee5d4b2f06070 SHA-256: 556eac54996c563a2e70c7ac1616cc6ad52b7d6475ab49bbbc64b6b37883a773
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'dafemum.ru'. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of a malicious URL suggests an attempt to lure the user to a compromised site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/123?utm_term=freedom+fighters+cheats In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426690/normal_5fdc622fab2c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457849/normal_5ff762b53bf58.pdfIn PDF document text
    • http://megesodore.iblogger.org/ca_full_form_in_science.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/f3acf005-0790-42d2-9d7e-97c1f0d5b8b9/574083937.pdfIn PDF document text
    • http://rawuwad.epizy.com/lewis_structure_worksheet_3_bf3.pdfIn PDF document text
    • http://mosararivifu.rf.gd/alabama_state_income_tax_form_40nr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/357306e4-a967-4c5e-8cf7-f808595a7bd7/lavuvasezipiniw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/881e67de-7bd6-4f5c-9d19-f43a0ec4cc0f/where_to_get_covid_test_in_newcastle.pdfIn PDF document text
    • http://vosowetawevu.epizy.com/pezopozemajebanugozarez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b1b576e-38ce-4d0a-8c81-56f7d934347b/dolivesupitisoliderisi.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/instrumen_naruto_grief_and_sorrow.pdfIn PDF document text
    • http://zudosikewemer.epizy.com/why_is_ethics_important_in_the_teaching_profession.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c300ae4-ac4f-4159-af0e-36757eb877e0/huckleberry_finn_quotes_chapter_1-8.pdfIn PDF document text
    • http://gedifigo.epizy.com/frosty_the_snowman_free_movie_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c49b8790-e38c-4e07-84bb-d0941ebba1c9/malibu_landscape_lighting_led_replacement_bulbs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72a93671-ca05-4c8b-a293-fd44129e8faa/but_how_do_it_know_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7a1fdac-cf42-44d0-9006-665ca7acce00/36911643963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc967f0-f7c8-4214-816a-4ba5d878794b/how_to_install_windows_step_by_step.pdfIn PDF document text
    • http://tawuzosidekelos.epizy.com/suniviragiletesu.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/benuxukozapizikaxiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/779075e7-db3d-42a0-8fca-73caf1b40dc0/lalawef.pdfIn PDF document text
    • http://bogurivesinoni.rf.gd/google_chromebook_os_free.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_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 5040 bytes
SHA-256: f270390b56d1eef3b860dac2faa5ec353e10cd25db117063cf79627111f334e2
font_01_sfnt_off00010270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 10840 bytes
SHA-256: 90ae06d2271637a77f2052f357a0e5fcc452fbb6a66977f86dd7fcae9c7ca8bb
font_02_sfnt_off00012792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12792 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34