Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8872fe103c6a85f…

MALICIOUS

PDF

121.6 KB Created: 2021-03-26 08:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: be2c54518ed47a0b80018c5315337b99 SHA-1: 95fbdb2f9c20469b8e24c4aee0ca53c07300cedb SHA-256: c8872fe103c6a85f1a554de85cb8778e09415d60a08a29c9cce108b36140aac4
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 0.9999

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://leonvi.ru/strik?utm_term=mythic+adventures+unlock+deutsch PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370294/normal_5ff8e7c3d24ff.pdfIn PDF document text
    • http://togimiguluvux.iblogger.org/bluetooth_keyboard_ipad_pro.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/run_for_your_life_midtown_charlotte.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_605bf26f92898.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388835/normal_5fc7c42617583.pdfIn PDF document text
    • http://puwofipafemuvif.22web.org/how_to_set_vivint_thermostat.pdfIn PDF document text
    • http://vebifitapex.mypressonline.com/45309126691.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nupuzawov.onlinewebshop.net/cambio_climtico_2020.pdfIn PDF document text
    • http://xegefonupekowa.epizy.com/ranger_aluminum_bass_boats_prices.pdfIn PDF document text
    • https://0978d23c-7b87-408a-b4ab-ff16da0dae51.filesusr.com/ugd/369d68_0de7116e32994f4897cc919634ec5f22.pdf?index=trueIn PDF document text
    • http://zuxekesimulir.epizy.com/ab_workouts_at_the_gym.pdfIn PDF document text
    • http://mowumaja.epizy.com/leadership_skills_development-_segment_2_study_guide.pdfIn PDF document text
    • http://guxajofiv.epizy.com/xerinaxutesoduvew.pdfIn PDF document text
    • http://wuzuzifo.epizy.com/azle_isd_athletic_forms.pdfIn PDF document text
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_d828afebc1e040d986d8797ec312042d.pdf?index=trueIn PDF document text
    • http://medidadebi.rf.gd/sudereletuwegoron.pdfIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_9d3b7070f6b74a289ef264176250c276.pdf?index=trueIn PDF document text
    • http://kelopejawutan.rf.gd/a._i._artificial_intelligence_movie.pdfIn PDF document text
    • http://poresiz.epizy.com/fivowobokijawobiw.pdfIn PDF document text
    • http://gajopule.myartsonline.com/familia_asteraceae.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_off0001a0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0D2 5260 bytes
SHA-256: 32f352057cd6e2adcacce1627842880a0f4d3e6c8c9be424c9ca575546e2c952
font_01_sfnt_off0001b2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2C3 11412 bytes
SHA-256: b7cf479bfedd4c6ebda3fc68a2e82579ec2eae89e2236cda914489404db26d72

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