Malicious PDF — malware analysis report

Static analysis result for SHA-256 651b3c8baf971305…

MALICIOUS

PDF

76.0 KB Created: 2021-04-10 19:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d82abcb83f80103d0cbd7af52c4cef0e SHA-1: fb55e2e3c389e0151876ace2edfc01f6fe21cf28 SHA-256: 651b3c8baf971305f0539f1bcbaf1a12842664d65298e09e02d7e0ea6b257f89
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links, with one prominent URL being https://jottigo.ru/strik?utm_term=ff7+remake+hard+mode+build+reddit. The presence of a link farm suggests an attempt to direct users to potentially harmful content or for SEO manipulation. No scripts were extracted, but the PDF structure itself is leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jottigo.ru/strik?utm_term=ff7+remake+hard+mode+build+reddit PDF link annotation
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/genuvavago.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/kajiwemala.pdfIn PDF document text
    • http://helpcontactform.com/75709838601g6bcx.pdfIn PDF document text
    • http://uchebnoe.website/idiopathic_thrombocytopenic_purpura_management_guidelines9aeke.pdfIn PDF document text
    • https://gonudelosake.weebly.com/uploads/1/3/4/7/134750135/2762100.pdfIn PDF document text
    • http://lnstagrambusiness.com/63456208532gnem2.pdfIn PDF document text
    • https://nedovewa.weebly.com/uploads/1/3/5/3/135316636/ec6783ad7.pdfIn PDF document text
    • http://characduwe.space/brother_hl_l2360dw_wifi_setupku0gl.pdfIn PDF document text
    • http://menbp.online/video_player_download_for_windows3mw4j.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/fevobelijogal/cute_japanese_cartoon_wallpaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26b1514c-c100-482d-8e40-0e062c43e9f1/62069501779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b1053d-7a12-4697-ab47-0901e3f0e750/how_to_reduce_stress_and_tension_in_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b20d177-8d21-40e2-ae96-5e363da938dc/63812116922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab480545-850f-4f9c-88c9-8e5ac7acb61c/ariens_24_inch_platinum_snowblower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1348cbe9-06ab-447a-b595-1782a9384ac4/god_of_war_4_novel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa798464-b796-4073-b047-54fb6ebae303/xerisikedarofip.pdfIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_685e28c8612241dc8cfb88e2406791ba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee3bf984-1799-45c4-ae28-477fa8bfdfde/29276901890.pdfIn PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_914dc0be15604d499a4c0521c5db2875.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/matunawewakuxoma.pdfIn PDF document text
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_512e1486ea2843f0ba513ac33086c576.pdf?index=trueIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_67c394b4cd584c3b8ec5b1a6afe0f1a7.pdf?index=trueIn PDF document text
    • https://38e81cab-313f-462b-917d-d566bf782aa4.filesusr.com/ugd/36aba1_f1cdbaab9fe2418d97a8f6afe13929d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/099a7c0a-e2ab-4b77-8043-bad66b198137/vedotewumefedutevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86f41078-65da-406e-a884-c86c3c86c423/85354625379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14cf8a70-7448-4136-94c0-cf6582686305/what_is_a_social_research_jobs_entry_level.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/28018049456.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_off0000ec8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 5208 bytes
SHA-256: c5cbaf733db92e7425b1bc50668cc54f16d376da9303801a5e8bed1e3077c8a7
font_01_sfnt_off0000fe1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 10688 bytes
SHA-256: 1129e9a17faadf542813960827f724ecdfbbc3aa0c0541e19e226bc0af417aa8

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