Malicious PDF — malware analysis report

Static analysis result for SHA-256 4709bfc4a66c109a…

MALICIOUS

PDF

77.1 KB Created: 2021-03-30 20:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 979fe0e255f4ec46a050be5e9e60749c SHA-1: 4f5faa44c08d8a66d6121c74ab10855302261791 SHA-256: 4709bfc4a66c109a9afa58c1eac2efb7c04dd10d572d4b6ede656322931cee78
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 0.9997

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 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://mezovuduw.ru/strik?utm_term=how+to+get+ham+radio+license+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459787/normal_6029774dc0395.pdfIn PDF document text
    • http://1freedom.space/knowledge_base_html_template_nulledfzf7r.pdfIn PDF document text
    • http://zuvomeronimewa.iblogger.org/does_tricare_cover_family_therapy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390381/normal_60081eb176a23.pdfIn PDF document text
    • http://osummer.space/32145928490vn0rv.pdfIn PDF document text
    • http://christmas-gift.ru/how_to_look_up_dunkin_donuts_gift_card_balancevhkd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490380/normal_5fd040e57ee5e.pdfIn PDF document text
    • http://cashfree.store/can_you_bury_animals_on_your_property7v0oi.pdfIn PDF document text
    • http://baugroup.info/dark_souls_3_dlc_reviewoep1v.pdfIn PDF document text
    • http://goodsfor.life/aswc-1_installation_manualflppf.pdfIn PDF document text
    • http://stopro.store/molosmbgbi.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/how_to_give_commands_to_alexaf7ows.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guxajez.rf.gd/32850338107.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/69834493491.pdfIn PDF document text
    • http://xuxivobanirug.epizy.com/65881575584.pdfIn PDF document text
    • http://juzuruwe.rf.gd/20745989991.pdfIn PDF document text
    • http://kejidexod.epizy.com/affairscloud_reasoning_puzzle.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/varus_guide_ap.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/twitter_data_on_iphone.pdfIn PDF document text
    • http://satonavuka.rf.gd/dukejivipir.pdfIn PDF document text
    • http://gekavitominugi.epizy.com/decimals_in_expanded_form_worksheets.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_off0000f02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02E 5408 bytes
SHA-256: 6786242523b057e3d7d145745438f131d65dddb772fc2a9b9ae5f5a8cbeca81d
font_01_sfnt_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 10840 bytes
SHA-256: 9329df2fa42862a1a4b0fff64bf833e2afe33d31a028f7e66c734e4f074f0575