Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee11806d067147c…

MALICIOUS

PDF

78.2 KB Created: 2021-02-25 07:06:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b263b58cb641b65ce60713f43a659f2b SHA-1: 50ba5f7a763f75e33dff3cdbe3c0874c4275f6b0 SHA-256: 4ee11806d067147caefc63f0e49e8f294261d2d67856ee815632572b14f071ea
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'maypoin.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links hosted on disposable domains, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=how+to+install+battery+in+first+alert+sa304 PDF link annotation
    • https://tawusizigegik.weebly.com/uploads/1/3/3/9/133997505/8de90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444374/normal_6015d84f27c87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484997/normal_5ff4eade1958e.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/jadesojaxaxifipisubarove.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465025/normal_5fd66a7b28083.pdfIn PDF document text
    • https://mejebepagomuda.weebly.com/uploads/1/3/4/4/134494428/90d0eb33156025.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxafopagad/wibjjDP/13454910223.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/g1UhbwD/exploration_craft_game_download_apk.pdfIn PDF document text
    • https://zatagigozot.weebly.com/uploads/1/3/0/7/130775916/pitekinorejog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452863/normal_602eb6411c8ad.pdfIn PDF document text
    • https://cdn.sqhk.co/wepaxuwelusu/gjaCuhj/helix_rise_jump_ball_rackets.pdfIn PDF document text
    • https://dozunetad.weebly.com/uploads/1/3/4/4/134472758/jusoxisarujopugo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wejufutaz.onlinewebshop.net/35744593758.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/45005868226.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/solucionario_algebra_lineal_grossman_5_edicion_espaol_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/ancient_cities_license_key_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/adobe_flash_player_for_mobile.pdfIn PDF document text
    • http://litorow.myartsonline.com/5552497982.pdfIn PDF document text
    • http://zevusup.atwebpages.com/present_simple_question_form_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/eu4_remove_center_of_reformation.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_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 5448 bytes
SHA-256: f202660213bd92d12617e70d7c6ece4858c5843c94107b629f259d20da151851
font_01_sfnt_off00010431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10431 11080 bytes
SHA-256: a80557368ce00c8fee956da381c4f68e21e4439cc0aef8488af30bcf10dcd4cf

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