Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefc92f767038994…

MALICIOUS

PDF

80.7 KB Created: 2021-03-24 18:55:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a66fa6de39cdf5b3f071ff375a8d7a8d SHA-1: 1803560f71429100b36b518c35ddd70b83c1e07c SHA-256: aefc92f767038994955e912ad5638e9094047a4813913a19d413b2a0fdf2fb7a
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 0.9998

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://resalured.ru/strik?utm_term=snes+cheat+codes+super+mario+world PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472793/normal_6012419a3ca7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_5fd95e5b16a5e.pdfIn PDF document text
    • http://vulufinagi.mypressonline.com/abbyy_transformer_2._0_crack.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471114/normal_5fc777d7e5976.pdfIn PDF document text
    • http://lotupojaxuvutix.mygamesonline.org/ciclos_circadianos_del_sueo.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/curvature_in_cartesian_coordinates.pdfIn PDF document text
    • http://pedagodogiko.getenjoyment.net/iupac_name_of_alcohol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488855/normal_5fcabc0984faf.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/ibijge2/hard_boiled_egg_maker_target.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478393/normal_5ff5f8a1b354e.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/adele_when_we_were_young_lyrics_karaoke.pdfIn PDF document text
    • http://gasurorir.sportsontheweb.net/adobe_reader_gratis_softonic.pdfIn PDF document text
    • https://cdn.sqhk.co/zokosofu/aEjeZia/watch_battery_tool_kit_walmart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_22e86100dee647c0ad00729f08160974.pdf?index=trueIn PDF document text
    • http://jupegojut.atwebpages.com/romisizog.pdfIn PDF document text
    • http://jomopizemiz.onlinewebshop.net/68603352405.pdfIn PDF document text
    • http://jadukubilelib.myartsonline.com/anganwadi_recruitment_2020_rajasthan_form.pdfIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_6e10ed2478ee4cf9b7a4f9cb320f2ba9.pdf?index=trueIn 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_off0000fb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 5508 bytes
SHA-256: 7bd5f60192eed8dc02ec35f0a6156e151dc0164f025a88e0eda69948e8a2a20a
font_01_sfnt_off00010da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA0 11308 bytes
SHA-256: ff49a0211286d852e72923665923cb51ede1655c1d5cde92d53487d37852373f

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