Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5569d4e8d1505f3…

MALICIOUS

PDF

79.4 KB Created: 2021-03-15 16:10:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7177e0a698c001c2256f15c7e8f262f8 SHA-1: 2a94fb67b7cdec7a49705e2a6817a4ec4743ee11 SHA-256: c5569d4e8d1505f31449eb82fd3731d0cbe1d3e61f11bffbdaa70f20dc82154d
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

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
  • 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://jacksth.ru/wix?keyword=interior+angles+of+a+polygon+investigation+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/wamiratena/fskieGj/warship_universe_naval_battle_mod_apk_free_shopping.pdfIn PDF document text
    • https://juzefujuninolu.weebly.com/uploads/1/3/1/4/131438825/vexagijokotafud_wuwur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389585/normal_603d249eeff1a.pdfIn PDF document text
    • https://bumeguzi.weebly.com/uploads/1/3/5/3/135391430/lavivoro-kuwajot-gumurese.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465024/normal_5ff1f358ce0fb.pdfIn PDF document text
    • https://nabivedoki.weebly.com/uploads/1/3/1/4/131407492/zesezakutidevu_vuwunutaj_vamapowod_vezixuna.pdfIn PDF document text
    • https://cdn.sqhk.co/rasirise/iekgdFA/suzupuxilepolirak.pdfIn PDF document text
    • https://lebotisoko.weebly.com/uploads/1/3/4/5/134597635/b1a20a3a.pdfIn PDF document text
    • https://zazobowelukoki.weebly.com/uploads/1/3/0/9/130969428/070fde7f8eb11f2.pdfIn PDF document text
    • https://niraniki.weebly.com/uploads/1/3/4/6/134662237/7863867.pdfIn PDF document text
    • https://cdn.sqhk.co/dopinaku/UADgikG/drug_lord_2_andy_lau.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwuwoki/hjhhe57/bronze_age_tools_names.pdfIn PDF document text
    • https://gafojeted.weebly.com/uploads/1/3/1/4/131452963/4938401.pdfIn PDF document text
    • https://sawuwirepugasup.weebly.com/uploads/1/3/0/9/130969548/261598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447647/normal_604f2ca50f20f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f13e49b-0ec4-43f6-bfa3-2221f37db7b9/where_is_the_serial_number_on_a_smith_and_wesson_686.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/kitodepiforuzow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6084b80a-f655-4187-9a80-a5cb52c8527c/how_do_i_use_my_employee_discount_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8b0cf6a-49c0-41ac-83d7-b56b8d043afb/vezobejijerukilorajububus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09e075be-26d4-4f26-984d-c0c51bfbaa4d/schwinn_airdyne_ad6_exercise_bike_reading_rack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e97db3a9-1070-4f1f-802c-3f0c0442a555/gamibitefigovij.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/types_of_triangles_worksheet_year_5.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_off0000f548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 5420 bytes
SHA-256: 426ec550be3297890181141d7ddf03326ecd27f177a1683de15a87c6975f2e77
font_01_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 11440 bytes
SHA-256: 9f609bc13369753cf7324b15afd9b676f6b534ce6db8631186125380eac0aab4