Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c28f785e434f8e9…

MALICIOUS

PDF

92.1 KB Created: 2021-04-23 08:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4eab9fb132cc2aff6c268faae8ded602 SHA-1: 259318b7c1420c67e29fd79620cb74d486f512f2 SHA-256: 8c28f785e434f8e95160e08047aa9f4dd2b0b4d22c50642f95f412c8a8c614e9
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure for a service manual. The presence of numerous disposable domains and link farms further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=mercury+25+hp+4+stroke+service+manual In PDF document text
    • http://boguzimaro.getenjoyment.net/wofegu.pdfIn PDF document text
    • http://callup.today/what_verse_talks_about_lucifer32ugd.pdfIn PDF document text
    • http://kelijoninofi.22web.org/requisite_organization_elliott_jaques.pdfIn PDF document text
    • http://navalny.design/68055061180oz3ki.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/are_they_making_a_series_of_unfortunate_events_season_4.pdfIn PDF document text
    • http://tezoxefakalexo.sportsontheweb.net/32841377772.pdfIn PDF document text
    • https://jizotigop.weebly.com/uploads/1/3/0/8/130874082/bepagi.pdfIn PDF document text
    • http://sks-expertiza.ru/epson_artisan_710_cannot_recognize_ink_cartridget8dxv.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/78908982467.pdfIn PDF document text
    • http://buytoday.cc/62907602735n33ho.pdfIn PDF document text
    • https://rovepegolotiru.weebly.com/uploads/1/3/4/3/134319415/ragaxurenuludiw.pdfIn PDF document text
    • http://alsamcctv.com/tuxitolukujazewetejn6e9x.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/eragon_full_movie_in_hindi_free_download_720p_filmyzilla2ypnz.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://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_fe5266a7f4d84c2fa03e7cae5da126e0.pdf?index=trueIn PDF document text
    • http://talakukatutevib.epizy.com/what_is_the_current_kindle_fire_software_version.pdfIn PDF document text
    • https://38c64f87-0506-4925-a3a1-425743e24937.filesusr.com/ugd/386d45_276666296b6443d3a5edfd562d18a4c3.pdf?index=trueIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_11a634abec1a4b47a2897205da96323a.pdf?index=trueIn PDF document text
    • http://zuzimadatunukag.rf.gd/fundamentals_of_communication_systems_download.pdfIn PDF document text
    • http://povuputuk.epizy.com/xixeparonulirotorarusar.pdfIn PDF document text
    • http://nuvebuxuloruvux.epizy.com/rigefukobidoz.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_off0001196a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 5628 bytes
SHA-256: 690909130b8edeb21c5316a27e9a9d95cabeb56321006f0d26e642ad450d33e4
font_01_sfnt_off00012c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C84 11892 bytes
SHA-256: 6ab0689febf9a170464a6e7119cdf3164e0242a830abac2963f941eac2766157
font_02_sfnt_off00015506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15506 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333