Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4daa2d72d73886…

MALICIOUS

PDF

75.5 KB Created: 2021-04-18 08:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ddf37256e5bc0f4c14eaad2fbb96ee7e SHA-1: 8246f7b6e2ad9e4862db18573dad0025696f2305 SHA-256: 1a4daa2d72d73886e42f60a7ac964b9ded60d24c8d2349a3d1c14dbfe156982f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=what+is+the+sound+of+a+green+tree+frog PDF link annotation
    • http://monstergym.ru/setagasewupapikem165n2.pdfIn PDF document text
    • http://vinograd.io/lugerinirowupiru8kwjj.pdfIn PDF document text
    • https://cdn.sqhk.co/tefupudoma/YadHjbv/76846393047.pdfIn PDF document text
    • https://cdn.sqhk.co/sepagumal/99YchgN/wagner_control_pro_250m_hea.pdfIn PDF document text
    • http://zoomita.space/beats_solo_pro_blue2om1o.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/preschool_video_songs9j62u.pdfIn PDF document text
    • http://subonus.ru/what_does_it_mean_when_your_thermostat_is_flashingdu9vn.pdfIn PDF document text
    • https://cdn.sqhk.co/jilowepe/eQigpjf/wofol.pdfIn PDF document text
    • https://sidedelozamuk.weebly.com/uploads/1/3/1/4/131482822/3526a36.pdfIn PDF document text
    • https://maxafusisiwesu.weebly.com/uploads/1/3/4/6/134688878/2834482.pdfIn PDF document text
    • http://fringigejy.site/vijumuzaluvpgv.pdfIn PDF document text
    • http://hydrofthol.space/67183684083e1zxe.pdfIn PDF document text
    • http://pochta-24.cc/munefukdoox.pdfIn PDF document text
    • https://cdn.sqhk.co/movozuba/hjcadge/lakupizu.pdfIn PDF document text
    • http://itabody.space/how_to_install_kali_linux_2020_on_virtualboxse2sc.pdfIn PDF document text
    • http://senteber.site/vocabulary_builder_activity_an_urban_society7dehu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb5b80e6-1f0c-4ea2-9af4-21aa9d03eab4/ditudaladawu.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/8026110706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6478f639-99fe-477f-87b4-72d25f236d52/contrato_de_arrendamiento_de_terreno_agricola_2019_para_imprimir.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/lyocell_bed_sheets_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/as_1288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b72dbe7d-63c1-4659-afd6-535e12473bdf/97665391847.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/bosch_oven_manual_series_2.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_off0000e7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A8 5148 bytes
SHA-256: bd9416dfe90d9ee2f3dea5239fdbddd402e8c73002862c654b020062db9432b1
font_01_sfnt_off0000f937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 11812 bytes
SHA-256: c534a5280f4378d983b01e22164ddba20547740c4b3841cb52c742c9734bf6cc

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