Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ba12278af443f6…

MALICIOUS

PDF

74.9 KB Created: 2021-04-04 01:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 86ba9076c83c94e61c418eddef3bd9e9 SHA-1: 59cba9a2d9c87504fa748da1744172c3a56de5ac SHA-256: b4ba12278af443f64e033e17c2f0dc22486a7e3c73fa3d0462fde24b8ab4dd90
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://midufefew.ru/award?keyword=sports+marketing+textbook+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385207/normal_5fde8427b4137.pdfIn PDF document text
    • https://cdn.sqhk.co/juxezijafoz/jdiijif/lg_v40_thinq_specs_att.pdfIn PDF document text
    • http://gratoraama.space/79870652163g45dj.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/WljhedC/20788385871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_6011761f99819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413867/normal_60435a5c337f1.pdfIn PDF document text
    • http://table-wait.com/transport_processes_and_separation_process_principles_solution_manualxn2ni.pdfIn PDF document text
    • https://cdn.sqhk.co/milagaleja/lSgeH6L/happy_merge_family_farm_game.pdfIn PDF document text
    • https://cdn.sqhk.co/riteximeras/oif1Uji/fizapizupovi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496853/normal_5fcb31b83ebfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464327/normal_602618eab63fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404112/normal_5fd64291cea85.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/3igC6Na/88806743570.pdfIn PDF document text
    • http://fartook.online/52579226226mtv22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_601b8b14b0d34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481684/normal_6001fed35fef5.pdfIn PDF document text
    • http://tixshopclub.space/dell_inspiron_530s_memory_upgrade5pg03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475559/normal_602753e765149.pdfIn PDF document text
    • http://blockhcain.host/fifty_shades_of_grey_download_300mbk6uan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zalolod.epizy.com/global_competitiveness_report_2007.pdfIn PDF document text
    • http://limirosu.rf.gd/c_for_dummies_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD967 5492 bytes
SHA-256: 862f3193d8db62c2f0938b73a61cd65b328aac83409380c3db3726398999c489
font_01_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 10572 bytes
SHA-256: 8e7cb573865c712011be6e19abcdb886563ed57ab7a2ce3932bc6aa4938eecfe
font_02_sfnt_off0001102d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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