Malicious PDF — malware analysis report

Static analysis result for SHA-256 a607f6976fb7f9a2…

MALICIOUS

PDF

77.9 KB Created: 2021-05-08 23:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e18e4392e5a98e7642385888680bfeb3 SHA-1: e8a21f2f5a6dfa2dc41509542e1ce6498ec5c3d7 SHA-256: a607f6976fb7f9a2d9a744dca2812e1a6d1c49852892e6023ef0e77b9bceaa65
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=how+to+think+positive+thoughts+when+feeling+negative PDF link annotation
    • https://semototip.weebly.com/uploads/1/3/5/3/135386148/koxozabumumid.pdfIn PDF document text
    • https://bowiromifax.weebly.com/uploads/1/3/4/6/134613330/b5d2040.pdfIn PDF document text
    • https://kenaveduku.weebly.com/uploads/1/3/0/8/130813649/6443631.pdfIn PDF document text
    • https://jivenikovo.weebly.com/uploads/1/3/4/3/134308789/rimamelekafuzonif.pdfIn PDF document text
    • http://lijamerogavex.iblogger.org/26208563758.pdfIn PDF document text
    • http://honbiz.pro/dell_latitude_e6410_keyboard_price_india8zh70.pdfIn PDF document text
    • http://amaryllis.space/using_r_with_multivariate_statistics_randallbmx3c.pdfIn PDF document text
    • http://fionainthefield.org/diy_google_cardboard_lensesp35rm.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/75203484649.pdfIn PDF document text
    • http://xupokaxe.medianewsonline.com/evenflo_tribute_lx_front_facing_installation.pdfIn PDF document text
    • http://trenolgia.buzz/vatabavaxojafitatona24ife.pdfIn PDF document text
    • http://fumexijana.getenjoyment.net/400_microgramos_a_miligramos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vizulubafaxal.epizy.com/kashi_kannada_movie_audio_song.pdfIn PDF document text
    • http://sedegagagojuwej.epizy.com/bblia_catlica_ave_maria.pdfIn PDF document text
    • http://mituzoleti.epizy.com/96330165542.pdfIn PDF document text
    • http://wififeju.atwebpages.com/batch_distillation_column.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/944801685.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/volume_of_a_cuboid_worksheet_tes.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/58713570561.pdfIn PDF document text
    • http://folapopapewoxa.rf.gd/93401160234.pdfIn PDF document text
    • http://pebujenutifovo.rf.gd/wujokakuzav.pdfIn PDF document text
    • http://lubunazunenixo.rf.gd/itil_incident_management_procedure_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/ubuntu_18._10_64.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_off0000f212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF212 5244 bytes
SHA-256: 5ba4d190a0768191c5afc5e4749131904338f61f82ff8ce7bf58347bcf4195cb
font_01_sfnt_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 10508 bytes
SHA-256: dbc1c3a5963cf6b123bfb8914d775879c5c3255322f9bb4903fd2bb76a6d55bf

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