Malicious PDF — malware analysis report

Static analysis result for SHA-256 5091c1e6294f98c5…

MALICIOUS

PDF

81.0 KB Created: 2021-05-04 03:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d6cafa06a870d36574eb4d9f008c3425 SHA-1: 2a1f692d923539e0a98f0630bdc624be06be7a59 SHA-256: 5091c1e6294f98c5c55a0682b0f15b5844aec5870a54eb40561e7ea9ac2b202b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL being `https://gimoguvi.ru/strik?utm_term=similar+triangles+practice+worksheet`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates the PDF is part of a link farm on disposable hosting, further suggesting malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=similar+triangles+practice+worksheet PDF link annotation
    • https://cdn.sqhk.co/wepiwojeta/jbijjif/26649714830.pdfIn PDF document text
    • http://d-youtube.com/tevuduxivurudesexigipuvjsdp.pdfIn PDF document text
    • https://cdn.sqhk.co/vatukaso/chbWidj/dafilanewixi.pdfIn PDF document text
    • http://trynutra.shop/software_testing_coordinator_job_descriptionp2m0v.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://luminar4-download.xyz/gazagirowafipafmr54i.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/igFHOgc/repeweriwomobin.pdfIn PDF document text
    • http://businesshelpservice.com/is_citizen_quartz_a_good_watch7huk3.pdfIn PDF document text
    • http://beach-fruit.fun/20461858720vfrnn.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/jiwisi/adjective_of_quantity_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba6da080-aa38-4ebe-9287-9b1faed3c5e1/burosefekadeparegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b423d1d6-c7c0-49d6-b42c-4d127e89a859/nizetejegebolefeje.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/the_zookeepers_wife_true_story_vs_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/376dfce5-6f29-4898-9b23-42c5c125aaa8/24883481046.pdfIn PDF document text
    • http://sakafusotevapa.epizy.com/58315154643.pdfIn PDF document text
    • http://texokobatogu.epizy.com/osmosis_dialysis_tubing_lab_answers.pdfIn PDF document text
    • http://vitimalu.rf.gd/harbor_freight_bunker_hill_security_camera_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cfc5fd1-e4eb-42fe-865d-0a18ab580ad0/what_is_chess_game_material.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 5604 bytes
SHA-256: d15f40216a1181d05d552676270fb6ac1b21ecc6aeafc8af598f451b0e77089e
font_01_sfnt_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 10048 bytes
SHA-256: 0808cdb490f3e6fa61888830d1227db6e07eb440fee2552d47f3dcc4ec5e6263
font_02_sfnt_off0001213e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213E 16096 bytes
SHA-256: 3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca

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