Malicious PDF — malware analysis report

Static analysis result for SHA-256 781405afb3de279a…

MALICIOUS

PDF

113.4 KB Created: 2021-04-08 02:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5bdfc4461afd2f1658cf731f29952bfe SHA-1: 29ae80d6c63265ca4055cb159c2ca01491e25801 SHA-256: 781405afb3de279a5f2185c3cec1ac95e9a18d95bd91cb4856cde01d53fb5231
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://jacksth.ru/123?utm_term=coding+sheet+adalah PDF link annotation
    • http://juvizex.sportsontheweb.net/20155908778.pdfIn PDF document text
    • https://cdn.sqhk.co/xobitabab/Gyhijfm/rex_sky_force_3d_settings.pdfIn PDF document text
    • https://mijutadozas.weebly.com/uploads/1/3/4/5/134590660/8319878.pdfIn PDF document text
    • https://budonofo.weebly.com/uploads/1/3/4/5/134520747/vukebujusuju.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/rzibSjh/tumuzo.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/hh2ihce/best_parental_control_app_for_ipad.pdfIn PDF document text
    • https://zunotebizi.weebly.com/uploads/1/3/4/6/134648513/384759.pdfIn PDF document text
    • https://cdn.sqhk.co/fuludasowipu/PfgeGjc/68178468980.pdfIn PDF document text
    • https://tirotoperanape.weebly.com/uploads/1/3/4/3/134315774/a10347ba7f5.pdfIn PDF document text
    • https://cdn.sqhk.co/sabepakofo/gcSjdzx/photo_studio_near_me_for_visa_application.pdfIn PDF document text
    • https://cdn.sqhk.co/nijusukelok/hegj7FP/tufoka.pdfIn PDF document text
    • https://cdn.sqhk.co/dofubetu/bigjdRS/cnc_vmc_programmer_job_salary.pdfIn PDF document text
    • https://kilejotiwig.weebly.com/uploads/1/3/1/4/131406519/fonovomira_xaxox_vunejivage.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/how_to_design_a_zen_garden_at_home.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/ca9c3491-a4ab-4fe9-99f3-78ffca960b9b/dilamuvuvimizor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c45b11d7-4f80-460e-bb64-56f169f9042f/cloud_security_alliance__self_assessment_1_answers.pdfIn PDF document text
    • http://netomadutimafe.onlinewebshop.net/bodybuilding_workout_plan_for_beginners.pdfIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_db2a057ca9e743e29065b4853d33bbf1.pdf?index=trueIn PDF document text
    • http://kepagewav.atwebpages.com/xovabasawopevisu.pdfIn PDF document text
    • https://377d1c6c-8747-407e-9a0d-bb8234813250.filesusr.com/ugd/f0b1fd_01f36387088e49849786330150b7e813.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_cdd0f0d5905d4a058f40ec2cb4aeb896.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e81f52e1-9c7e-4050-bafa-5fc01e53b6b9/stories_to_read_to_unborn_baby.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_off0001048d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048D 41512 bytes
SHA-256: 9246768aa3959360608980cbc4688056df3db3c65e1bef280a4c15aca81714b1
font_01_sfnt_off00018326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18326 4896 bytes
SHA-256: 834ee7283d6492dec2b79f3857522e616dfa615f62c1150ac1add3f44faad656
font_02_sfnt_off000193c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193C9 10532 bytes
SHA-256: 3096b204d4f3843af6cbad19f790592825bd358b588f926534bbde1cf13390d4