Malicious PDF — malware analysis report

Static analysis result for SHA-256 868243133149fb9f…

MALICIOUS

PDF

76.1 KB Created: 2021-04-10 14:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9fe6f222b46cd0455ca28fe171b1479b SHA-1: 18cdacc3429988b89d830706e63e85c569d3a2a3 SHA-256: 868243133149fb9fcdca03dcc3967a88b93034c684643dede94df5a751944fb0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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 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.
  • 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://dafemum.ru/strik?utm_term=the+monkey%2527s+paw+2011+full+movie PDF link annotation
    • http://nunovoxiwanafuz.getenjoyment.net/mitel_5312_ip_phone_voicemail_setup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495854/normal_603754384e54f.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/thinking_maps_examples_for_science.pdfIn PDF document text
    • https://mojiwisixireze.weebly.com/uploads/1/3/4/6/134615440/sukeligopevimigeliwi.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/aeroelasticity_of_plates_and_shells.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408324/normal_604412c11113b.pdfIn PDF document text
    • https://xusumenebob.weebly.com/uploads/1/3/4/4/134478057/8522431.pdfIn PDF document text
    • http://tasiperop.medianewsonline.com/93381657083.pdfIn PDF document text
    • http://wixujikubipom.mygamesonline.org/example_of_abstract_in_thesis_paper.pdfIn PDF document text
    • http://nosumiva.mywebcommunity.org/axis_and_allies_1940_rules.pdfIn PDF document text
    • http://mukinokelek.mygamesonline.org/how_to_sign_file_electronically_for_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bufexa/juniper_3200_switch_datasheet.pdfIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/femeri.pdfIn PDF document text
    • http://dugerem.atwebpages.com/ficha_biopsicosocial.pdfIn PDF document text
    • http://tifavamifikas.myartsonline.com/anime_drawing_references.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/learn_how_to_draw_anime_characters_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/how_to_replace_valley_faucet_cartridge.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/cub_scout_lion_handbook_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/tonefajimilo.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/ariana_grande_focus_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/habitos_alimenticios_oms.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_off0000eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 5672 bytes
SHA-256: e314df054e77da26b4ec2eeb9fa926507b8b3098ac800483cee50e65aafcf9fc
font_01_sfnt_off0000fe34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 10976 bytes
SHA-256: 1dea852cba2c989fea29d094d225a6f5b497660255d6e2844fb917c6eb7575c0

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