Malicious PDF — malware analysis report

Static analysis result for SHA-256 819cb0eb50ce0321…

MALICIOUS

PDF

80.4 KB Created: 2021-03-25 02:24:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d00fc8260fd58ae2f6a587f90d5433d0 SHA-1: 7e2f0b2b12435f03a2d764588f2bd29051677567 SHA-256: 819cb0eb50ce03211c4570d274c6a0bb6c0c82a9094fcd50fbe1c3c2f797833e
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 critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure. No scripts were extracted from this sample, but the presence of external URIs and the overall detection profile strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://kuzutuzo.ru/award?keyword=functional+training+routine+pdf PDF link annotation
    • https://vurutosefitipa.weebly.com/uploads/1/3/4/4/134479444/e6395.pdfIn PDF document text
    • http://byseles.xyz/fesakuxibixiposabiwabusa19eek.pdfIn PDF document text
    • https://ponozivodu.weebly.com/uploads/1/3/0/7/130775347/c5971f507.pdfIn PDF document text
    • https://kebopudej.weebly.com/uploads/1/3/5/2/135298692/53f8ff.pdfIn PDF document text
    • https://cdn.sqhk.co/wesifarajaru/b4sdmgi/editable_preschool_lesson_plan_template_free.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/f2LvhgY/24515624381.pdfIn PDF document text
    • https://cdn.sqhk.co/lilanoto/higAjMg/fiba_women_s_basketball_world_cup_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/jffjfjc/raxetap.pdfIn PDF document text
    • http://help-business-media.com/jusazitq6627.pdfIn PDF document text
    • https://livadasim.weebly.com/uploads/1/3/4/3/134312527/1979667.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/hfjeCHM/kabubevigiw.pdfIn PDF document text
    • http://snapchat-alert.com/how_do_climate_change_affect_animalsl2r8v.pdfIn PDF document text
    • https://memuvarava.weebly.com/uploads/1/3/1/3/131384606/4205482.pdfIn PDF document text
    • http://subfamjtii.site/how_to_set_liftmaster_garage_codeu79th.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
    • http://roweviwumi.epizy.com/diagnostico_ambiental_local.pdfIn PDF document text
    • http://jidojig.epizy.com/35619457719.pdfIn PDF document text
    • http://futepukunodur.rf.gd/shoulder_active_release_technique.pdfIn PDF document text
    • http://rinutupumopak.rf.gd/biometry_download.pdfIn PDF document text
    • http://dizibabazuvuxu.rf.gd/253260353.pdfIn PDF document text
    • http://bobupugarini.epizy.com/cts_bpo_interview_questions_and_answers.pdfIn PDF document text
    • http://legujajojozete.epizy.com/jogurigajexogawenadinoger.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_off0000f0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 4980 bytes
SHA-256: 8d0d723b39defb07b4ab7da2eab21bd05aad4bdc3ca652074770f88229661c3c
font_01_sfnt_off000101a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 10156 bytes
SHA-256: 64ab3526c8cfeb6d3158f7a405d072cfb5a2a855c06653340628bf7c202719a5
font_02_sfnt_off0001245e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

Open this report in the interactive analyzer, or submit your own file for analysis.