Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fdf7fea6bc7f136…

MALICIOUS

PDF

76.7 KB Created: 2021-05-08 10:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fc433bbfd557b98048cd8cdda89a56af SHA-1: cb9b2ecbba630b83646e329de4cbe484d1da23c3 SHA-256: 4fdf7fea6bc7f1368fc933d67f80f3c72c4d695e2af5e130763c4110718f7c8d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=virtual+girl+hd+desktop+windows+7 PDF link annotation
    • http://matizaw.mywebcommunity.org/78770861853.pdfIn PDF document text
    • http://fajasated.mywebcommunity.org/booker_prize_winner_books.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/59566025093.pdfIn PDF document text
    • http://nadefememidep.medianewsonline.com/revuxe.pdfIn PDF document text
    • http://zoxodur.sportsontheweb.net/abc_matching.pdfIn PDF document text
    • http://befujukipepejem.mygamesonline.org/introduccion_a_la_robotica_para_nios.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/vascular_and_nonvascular_plants.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/rabuxugenefefe.pdfIn PDF document text
    • http://poruzotosiku.getenjoyment.net/printable_bathroom_passes_for_high_school_students.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/18077897045.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/f3197ac4-c39f-4327-ab37-9ecd6cac400a/how_much_does_enhanced_drivers_license_cost.pdfIn PDF document text
    • http://xakazasaravi.onlinewebshop.net/57677496797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f3e3321-cb6a-461c-a646-92c4759b5b71/kuvuz.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/auld_lang_syne_sheet_music_musescore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a12fd8-abc1-4221-9889-e7cb7c79c1b5/zufilezifepigaxoju.pdfIn PDF document text
    • https://951e66c5-660f-4748-bfcc-a6cc0831133d.filesusr.com/ugd/4967bb_119010ed7dbf4006b6ee212651d2c6ef.pdf?index=trueIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_e3be2039550c43e6926aad08a6b6d676.pdf?index=trueIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_7356c04b574146c690d45b444057faa2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ginutu/beautiful_disaster_tattoo_ambigram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbf4eb2e-e032-4842-9381-4791cbfacd24/75640386285.pdfIn PDF document text
    • http://zejusamipokera.myartsonline.com/human_trafficking_prevention_methods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fe511be-93c3-4274-9687-08263b9a4f4f/56005275728.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_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 5420 bytes
SHA-256: c19379d67b64fc31d40eb7d59fbbc9b6648ac69ad5cb44ce165c69de2ac89fa8
font_01_sfnt_off0000fee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 11776 bytes
SHA-256: 18e9917cb6cea5fbc6702ea329533544cd562557a31b13307bb68427605da213