Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c304d00d670bda3…

MALICIOUS

PDF

73.6 KB Created: 2021-03-24 14:00:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 957768272a80f0a2dc39783a8e7196f2 SHA-1: 55585af1fea6db46142d7012c92990612f15b154 SHA-256: 8c304d00d670bda3b018f620ae13f8501d72b771bf26a9ea2c78e3610f2a4513
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 0.9991

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 http://topuniversityru.fun/33179357921z392.pdf In PDF document text
    • https://vojonabof.weebly.com/uploads/1/3/1/3/131383251/pezoxipi.pdfIn PDF document text
    • https://rivewatot.weebly.com/uploads/1/3/3/9/133999312/komam.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/elementary_linear_algebra_10th_edition_solutions_slader.pdfIn PDF document text
    • http://bu-markett.com/cen_tech_62120_software_updatepn7g9.pdfIn PDF document text
    • http://iqecoportal.ru/buvadaxofaritojusazimeg8uiia.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/16247231905.pdfIn PDF document text
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/3c629.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/xagafaguxasomuvonotijevaj.pdfIn PDF document text
    • http://gadivawiw.sportsontheweb.net/diono_2020_radian_3qxt_4_in_1_convertible.pdfIn PDF document text
    • http://bukupiduge.mypressonline.com/bixokadipiwifogoxewetuku.pdfIn PDF document text
    • http://paxabak.mypressonline.com/63764556665.pdfIn PDF document text
    • http://uaregroup.com/bank_teller_job_resumecdri5.pdfIn PDF document text
    • https://fidedelab.weebly.com/uploads/1/3/4/0/134096197/2515743.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/wb/ENAH/~3/4NO0L8wlyOA/wb?keyword=is%20the%20ccna%20test%20freePDF link annotation
    • http://polilofu.onlinewebshop.net/blood_type_b_food_chart.pdfIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_15f1aa77916d49a693fc3f4845d2dfc8.pdf?index=trueIn PDF document text
    • https://6e00f30c-c2f4-4f8b-b3fa-04142e93d3a6.filesusr.com/ugd/7b3c9f_f548d87cead1480d84c31faae21cfdff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/vawewemujijoj.pdfIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_5ce374adfffd4400a52f31f30b1883af.pdf?index=trueIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_80da44128283446db8c5db187835d052.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/13538832643.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/java_string_format_double_percent.pdfIn PDF document text
    • https://21036261-01f9-4725-a342-2b8b08d10099.filesusr.com/ugd/d0cbc4_574823a508cb4041b1aa0384827cef20.pdf?index=trueIn 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_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 4504 bytes
SHA-256: c41a4b49e9797b67031e80cbea692cae8d7cb75e493c14785cad7697dc4a4e89
font_01_sfnt_off0000e6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 10720 bytes
SHA-256: 718f16ed6a070235ded1019a3fabceca9f84ec195d942fe83aba3482ed4d576e
font_02_sfnt_off00010b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B16 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2