Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ea51b1a8b99327…

MALICIOUS

PDF

78.7 KB Created: 2021-05-12 07:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d95d58fae6b99e59a2f155dea6998bd3 SHA-1: b7b32ebb5a0b8849d40b8e33be799d24ec8305fa SHA-256: c9ea51b1a8b99327b0dc6f9712030f5fc42881bac0ad08ce757eda1cddfa8bdc
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a phishing/malicious document. It contains numerous external links pointing to disposable domains, suggesting a campaign to generate traffic or distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://fokemale.ru/strik?utm_term=what+signs+are+born+in+december PDF link annotation
    • http://jijufik.22web.org/xopadakero.pdfIn PDF document text
    • https://sasopezanureje.weebly.com/uploads/1/3/4/6/134691995/rilapukatipe_jabowutosa_wiwufogukun_nemubedako.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456687/normal_5ffbf151b4b8e.pdfIn PDF document text
    • http://jalimojaben.iblogger.org/diprosone_soluo_bula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496374/normal_605a1c1078c53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_60138c87f1cd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_602d8d1a0a8be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402940/normal_5fdbe5d51c559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451932/normal_6051182796086.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486984/normal_5ffbac44a3572.pdfIn PDF document text
    • http://anyita.space/notice_of_meeting_and_agenda_sample98djc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368495/normal_60358622121ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393515/normal_5fd2abef1b174.pdfIn PDF document text
    • https://jitogomufe.weebly.com/uploads/1/3/4/5/134588764/zipatimebutila.pdfIn PDF document text
    • https://rozenawaxu.weebly.com/uploads/1/3/4/5/134517597/kakubutute_kefevodiraz_ripobukabebifij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419818/normal_602a7488c2111.pdfIn PDF document text
    • http://prizinsta24.online/what_does_the_idiom_monkey_business_meansxmcga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kubafezin/66149167127.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/lesejafa.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/verb_have_got_exercises_primary.pdfIn PDF document text
    • http://jusudab.epizy.com/christmas_card_templates_for_photographers.pdfIn PDF document text
    • http://gagolugumetuvo.epizy.com/rice_krispies_nutrition_information_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/stansted_airport_flight_information_live_arrivals.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/sodosarudobixu.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_off0000f631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 5472 bytes
SHA-256: 7c46d92c523973da42422481d151f595655bcbb2bc3d80742a726949ea440542
font_01_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 10296 bytes
SHA-256: c04bc07837645392bd0ff392042d2f19bc1683ae58e33df0e4e5d820f16918f2