Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7145d854c7d67c0…

MALICIOUS

PDF

75.4 KB Created: 2021-03-17 15:29:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e3e2fc4f40e188166e8078512531fdbc SHA-1: 2a79e62653c51ca903f41f9394deafe1e2ae3ddf SHA-256: a7145d854c7d67c07cdc9934fc772ab0fd54142f1a2f6a89b3a60e2d4eb8154b
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 0.9997

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://midufefew.ru/strik?utm_term=7th+grade+pearson+math+book+answer+key PDF link annotation
    • http://leyloften.online/63519239318rjard.pdfIn PDF document text
    • http://apelsins.space/modern_day_plague_sars8a62t.pdfIn PDF document text
    • http://lightstart.xyz/52593126070h3769.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/2hbig4k/jizalegolodumogofuweme.pdfIn PDF document text
    • http://pebunoguge.mygamesonline.org/las_vocales_para_colorear_en.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423453/normal_60372963127ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471988/normal_5fc70cd038812.pdfIn PDF document text
    • http://kodepovorivapi.mygamesonline.org/generos_periodisticos_informativos.pdfIn PDF document text
    • https://cdn.sqhk.co/dabebasavus/yidGYjh/transfer_news_twitter.pdfIn PDF document text
    • https://cdn.sqhk.co/zolususux/gcVOu5w/18250370235.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/uM9bigc/19825180221.pdfIn PDF document text
    • http://clubstore.pro/90890842917f7f6w.pdfIn PDF document text
    • http://thrivewebs.com/where_do_mutt_dogs_originate_from7v4ww.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
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_3a03b114416747ce8d8770e1f0a0bd8c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d79b391-51e9-487d-89cd-e52b1b2f55ba/31615555188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9927be5-9dea-4650-8417-5bd49282492b/semuzaribipadefaroju.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_b634d0aa3073442d9e9d339f9acd2151.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af8eabe-d376-45db-a195-e94563dabadb/how_to_make_emp_slot_machine_jammer.pdfIn PDF document text
    • http://pimoxonevuwewax.atwebpages.com/atmospheric_science_an_introductory_survey_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a00fccd9-4e85-40cc-9ced-a6c3e74169ea/pizutemibenesomoki.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_off0000d95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95F 5464 bytes
SHA-256: 09f8402b082ecae9d0b99718503543324926787187c46a08cb61d7c45183bbfd
font_01_sfnt_off0000ebd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 11244 bytes
SHA-256: 21b30f6b867522d8eeef2284119696756a2f3fcdb0a9558db2edcc3a984a7bc5
font_02_sfnt_off000111f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F9 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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