Malicious PDF — malware analysis report

Static analysis result for SHA-256 2171f8a80e173652…

MALICIOUS

PDF

90.7 KB Created: 2021-04-04 17:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2a16032710c782efdd0e9350131bb537 SHA-1: b99416173d2ab009df5d94d7b2ee878ac5866a8a SHA-256: 2171f8a80e1736529959c69e04d8df31d8bc60fb8f3dd298ad45a8da2f965a69
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 0.9961

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 https://golowaki.ru/aws?utm_term=kenmore+500+dryer+not+spinning PDF link annotation
    • http://nepatokada.mypressonline.com/asme_section_ix_free_download.pdfIn PDF document text
    • http://filozajerezabi.getenjoyment.net/qs_world_university_rankings_2020.pdfIn PDF document text
    • https://jeraligasusuwaj.weebly.com/uploads/1/3/4/5/134528446/divupemi-senopimax-durekevo-pozoleduwa.pdfIn PDF document text
    • http://digogipexoluku.iblogger.org/24196431903.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/96015701026.pdfIn PDF document text
    • https://ranitezal.weebly.com/uploads/1/3/1/4/131438109/nofofo-fixegusama.pdfIn PDF document text
    • https://palisuxil.weebly.com/uploads/1/3/1/0/131071308/kovoteg.pdfIn PDF document text
    • https://wexasubofuxumeb.weebly.com/uploads/1/3/2/7/132740188/zakivi_nekerilipifut.pdfIn PDF document text
    • http://lexamopelezun.mywebcommunity.org/57471059026.pdfIn PDF document text
    • https://jedegifopa.weebly.com/uploads/1/3/0/7/130738854/sorokavegasuk-gekoxin.pdfIn PDF document text
    • https://joxedobiwot.weebly.com/uploads/1/3/5/3/135350216/getajadajugogebas.pdfIn PDF document text
    • https://tedawubav.weebly.com/uploads/1/3/4/3/134376018/4036c5.pdfIn PDF document text
    • https://wivaralizufijol.weebly.com/uploads/1/3/1/4/131483386/gisakarezojad.pdfIn PDF document text
    • https://mavuweginu.weebly.com/uploads/1/3/2/6/132681431/lenakikifumajofuji.pdfIn PDF document text
    • https://sidatenut.weebly.com/uploads/1/3/5/3/135349940/6483724.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aeedc83c-a41d-4179-9d48-e770e4c4cd47.filesusr.com/ugd/e010a7_a2665ac9acf84635b010dc3d379f7c51.pdf?index=trueIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_1d70b9c09f8044859c3162b4c9fda3ac.pdf?index=trueIn PDF document text
    • http://kojuvurapamox.myartsonline.com/college_panda_act_english.pdfIn PDF document text
    • http://bekusisit.atwebpages.com/beginning_anomaly_detection_using_python_based_deep_learning.pdfIn PDF document text
    • http://tibutariwu.myartsonline.com/advanced_algebra_formulas.pdfIn PDF document text
    • http://zobuxosem.rf.gd/collegiate_comfitec_bridle_size_guide.pdfIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_a3467bbaf0eb47f3889ccc3f0b963baf.pdf?index=trueIn PDF document text
    • http://wuwedilejom.myartsonline.com/paper_chromatography_questions.pdfIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_890dd658ea7e499580e552227d2e641a.pdf?index=trueIn PDF document text
    • http://xobebol.onlinewebshop.net/ratio_decidendi_and_obiter_dictum.pdfIn PDF document text
    • http://libavomaf.epizy.com/fojif.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_off0001218d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218D 5372 bytes
SHA-256: 700ee9a948cfe66b07f97ae7774fbe64572f05597479cb5325efd2b99c682718
font_01_sfnt_off000133d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D2 11956 bytes
SHA-256: cbbc2f1e483be029bf58ec456279d2527b6045b0e315d902b25d91c495647b1c