Malicious PDF — malware analysis report

Static analysis result for SHA-256 828e96187bf30841…

MALICIOUS

PDF

74.4 KB Created: 2021-04-02 21:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0a1cc9b3f9bdc8f1df9a43659a96ea3e SHA-1: 4b8babf6876f2fa5dbc98863d14928820f291bb8 SHA-256: 828e96187bf308416295b3b494d64db4e1697af681b3606211cd5fd4993cc09c
184 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to disposable hosting or known malicious redirectors. The primary malicious link identified is https://dafemum.ru/strik?utm_term=how+to+train+for+swat, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, appears to contain text related to training and potentially lures users into clicking these links, which likely lead to phishing or malware download sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=how+to+train+for+swat In PDF document text
    • https://static.s123-cdn-static.com/uploads/4458161/normal_5ff232a2ed19e.pdfIn PDF document text
    • http://pexawegowe.mywebcommunity.org/dozafonuvuzowobino.pdfIn PDF document text
    • http://ripugusulufiluj.getenjoyment.net/kuwuj.pdfIn PDF document text
    • http://modozadubop.mywebcommunity.org/subjects_objects_and_noun_complements_exercises.pdfIn PDF document text
    • http://joweponula.mywebcommunity.org/cnidaria_phylum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378836/normal_5ff1ce5f3c52e.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/how_to_get_legendary_adopt_me_pets_for_free.pdfIn PDF document text
    • http://bumululoru.mywebcommunity.org/fotezawolulusowadomabo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485445/normal_602ef13d133cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vejegaba.atwebpages.com/what_does_managerial_accounting_focus_on.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/what_are_the_6_core_values_of_social_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9bc11f0-59f0-46c6-8783-4163f68740ed/plc_programming_software_for_mac_os_x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0a5f267-b5e0-4b07-bd4a-c46a633d235e/23436463780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d276ee0-7ab9-4348-9475-ce6e5c999069/most_common_phrasal_verbs_in_english_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b4ede4-bd7e-44b4-94c2-32846de6bc38/book_report_ideas_for_3rd_graders.pdfIn PDF document text
    • http://paguxesij.myartsonline.com/15260112297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6082a4f-e0ac-48bf-91ee-4fca041edcd1/68748670776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e3b275b-1878-43a2-9e38-30e084da7369/kavopidelorujefegida.pdfIn PDF document text
    • http://niwimugosaz.onlinewebshop.net/audiolibro_amar_o_depender_walter_riso_descargar.pdfIn PDF document text
    • http://bojepudadadax.atwebpages.com/tuvofixewadizinuvikeza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/117d2252-78cf-41e9-83c3-7d007360a618/joe_vitale_concrete_strategies_net_worth.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_off0000e94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94A 4780 bytes
SHA-256: 429573fe055891423178f6d0519b4a58abfcec3bc9c161f4eed8bc779680f61c
font_01_sfnt_off0000f9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 10228 bytes
SHA-256: 942547e6719983e81516090323fae2fee0afef1d39909b2b5d0e46d6f6462d36