Malicious PDF — malware analysis report

Static analysis result for SHA-256 84cc7d3a5e86d57c…

MALICIOUS

PDF

96.0 KB Created: 2021-04-09 12:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 436343d70ea878c6f897d46c856d075a SHA-1: 821dfb0fa6f2f2b7b1094262ae45d2c51c88de51 SHA-256: 84cc7d3a5e86d57ca2a6f6eb5551fd27796fe9d73a241e97fa31f20137e7de83
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 0.9996

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://pelibifir.ru/strik?utm_term=john+deere+240+skid+steer+battery+removal PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453335/normal_606bd64086e9b.pdfIn PDF document text
    • https://cdn.sqhk.co/sunidoxil/djiaPhd/voice_game_jump_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480743/normal_5fffaa4a3d34b.pdfIn PDF document text
    • http://totalcreditreport.info/bakofomapugamifosazaphbl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411691/normal_5fee450a8497b.pdfIn PDF document text
    • http://frontglass.xyz/cartoon_character_maker_apku8c3w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458837/normal_604005a5f1829.pdfIn PDF document text
    • https://cdn.sqhk.co/wekajibex/njcLjcq/adventure_island_3_free_download_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416660/normal_5fff1a5ea676d.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/Njdjhjd/star_wars_vintage_collection_mandalorian_target.pdfIn PDF document text
    • https://cdn.sqhk.co/rivinodati/chb85Nt/football_player_career_mode_games.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/baxuvatiromaxapugenegil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489237/normal_5fd12d0ce8f42.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/gowimajemarezitexjn7r9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448731/normal_5fee1c4745e36.pdfIn PDF document text
    • http://godotobekof.scienceontheweb.net/askep_asidosis_respiratorik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426072/normal_606dc8457381e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_601b94b6da271.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459941/normal_5ff88977aa308.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zukomakiduw.myartsonline.com/mejijukera.pdfIn PDF document text
    • http://romofimor.onlinewebshop.net/gene_ontology.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_off00013c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C66 5784 bytes
SHA-256: d2a68cc283d2bd8745fc6a5bc4475987d59e51a7f01700fedf3a0feb9ebb6472
font_01_sfnt_off00014ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF1 10112 bytes
SHA-256: eab462c64a2eb49aed15bce36be149c16e191879a6688b7061bfb34b676e2d45

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