Malicious PDF — malware analysis report

Static analysis result for SHA-256 97090b19ae2c4740…

MALICIOUS

PDF

79.8 KB Created: 2021-05-01 23:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e4a48edadb195911d9b66f9d73340069 SHA-1: 5082310b9eb74b8726cec22fd7bd84e00b0ba331 SHA-256: 97090b19ae2c47403f97dfac6a7c72b2100091ab7bcf79cd0d2c2ee2aed1e100
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=how+do+you+study+for+pmp+exam PDF link annotation
    • http://fejavodexata.getenjoyment.net/noam_chomsky_who_rules_the_world_review.pdfIn PDF document text
    • https://daxigowopijadek.weebly.com/uploads/1/3/0/8/130814785/sosipuzikexumesanose.pdfIn PDF document text
    • http://tuvosudokalidu.scienceontheweb.net/tubetujamatarixezewopit.pdfIn PDF document text
    • http://tesupelaj.sportsontheweb.net/lufosegifaweforona.pdfIn PDF document text
    • https://sisaravebopaz.weebly.com/uploads/1/3/4/5/134590876/694849.pdfIn PDF document text
    • http://sukutoxuwurif.mywebcommunity.org/20093198813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383678/normal_606aaad78e8c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465545/normal_6014c49cb701c.pdfIn PDF document text
    • https://zefisuket.weebly.com/uploads/1/3/4/8/134868467/zexepewezeve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guvamimifufirar.rf.gd/juzitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93915bb2-5009-4f41-b354-132b74de0c59/46951654001.pdfIn PDF document text
    • http://morukigivarili.rf.gd/17639282903.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/tsa_arrival_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/grandma_got_run_over_by_a_reindeer_lyrics_home_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/147e377a-1934-40fd-bef0-595d4177562a/how_to_do_nanda_nursing_diagnosis.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_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 5380 bytes
SHA-256: bfe833fca43bb386dfd22e87b525e23b5bb945b528f9aec8eac5fcdc23ad0931
font_01_sfnt_off00010ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE1 10508 bytes
SHA-256: 8a3a40c8d8d4a93388afa4d187f2e33711cdc51e1a66f88de182cb675bc44443

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