Malicious PDF — malware analysis report

Static analysis result for SHA-256 f471618909889197…

MALICIOUS

PDF

86.9 KB Created: 2021-05-11 17:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d77e659c41629e67e3969c596f771d3e SHA-1: 69e4cc8e0cd432bd59bcc8e67532f7527cffe809 SHA-256: f47161890988919737046ec9a679e7cd770ab0531c97b95c95ce1b3f5ca4e87d
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be related to search terms for 'Nyssma manual 2013 pdf free', indicating a lure to trick users into visiting potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://midufefew.ru/strik?utm_term=nyssma+manual+2013+pdf+free PDF link annotation
    • https://pitulero.weebly.com/uploads/1/3/2/6/132683003/944285.pdfIn PDF document text
    • https://lukimozogu.weebly.com/uploads/1/3/4/6/134638062/nadajapo.pdfIn PDF document text
    • http://radapox.iblogger.org/basic_computer_knowledge_book_download.pdfIn PDF document text
    • https://mofazutozu.weebly.com/uploads/1/3/4/8/134871383/ritexerofifav.pdfIn PDF document text
    • http://lutolojom.22web.org/85684756977.pdfIn PDF document text
    • http://dedotiroviwef.22web.org/bangla_live_tv_free_software.pdfIn PDF document text
    • https://nufirejibojo.weebly.com/uploads/1/3/4/6/134645492/4090856.pdfIn PDF document text
    • http://tirudibemaj.22web.org/sifufibesonasid.pdfIn PDF document text
    • https://topagolidokade.weebly.com/uploads/1/3/4/5/134502990/3393260.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://katezoluvezile.epizy.com/49332598615.pdfIn PDF document text
    • http://sesugemedolaf.rf.gd/9997746641.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/sizuvepiridepifo.pdfIn PDF document text
    • http://pazabod.epizy.com/aminoacido_fenilalanina.pdfIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_0090b707cde1481080fe5c24288b3d4b.pdf?index=trueIn PDF document text
    • http://xofunuxemijowex.rf.gd/14642735455.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_ba50a35e4c66479dbb0d3dfc0e79f170.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/do_you_need_a_license_to_operate_a_ham_radio.pdfIn PDF document text
    • http://gajedimigifupet.epizy.com/imca_guidelines_for_dynamic_positioning.pdfIn PDF document text
    • http://xugeseza.epizy.com/panixizemera.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_f57adfae6c3f4f50a31ff35bff631246.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tenunud/jajafovomawoneveta.pdfIn PDF document text
    • http://xobekorafoza.epizy.com/zenuginutadiresefizi.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/31949989097.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_a91da548c2f74c3b8900d5a2cfccd7b9.pdf?index=trueIn PDF document text
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_e748994ecfc148e4bf0fad1bfce4d8e9.pdf?index=trueIn PDF document text
    • http://gezewezelatemak.epizy.com/google_maps_api_python_distance.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/lemelojugumivuwokapij.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_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 5748 bytes
SHA-256: 2c3b70e0d2135b02a65fcb9a4de3eec16e04495521acc68219bae66a53ade3c8
font_01_sfnt_off00011299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11299 11472 bytes
SHA-256: 5b5af5ea80f5749aa8295b32b7517f0a632f3d6c7eb04c45e92c6a02e673b7f0
font_02_sfnt_off000139ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BA 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90