Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d37d28513b0cc5…

MALICIOUS

PDF

79.4 KB Created: 2021-03-16 21:22:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b33a09ceab111f47e1bf0c261d395057 SHA-1: 4d3b9e5f44f3168f5d3cdfd1c497a3587e854d33 SHA-256: 17d37d28513b0cc563dece713f9fba8c2fa26b3bf02ac5f530910bf11d0e5527
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/award?keyword=computer+organization+and+assembly+language+book+pdf PDF link annotation
    • https://togurugake.weebly.com/uploads/1/3/1/4/131412858/0728e30b6f.pdfIn PDF document text
    • https://geduletulaf.weebly.com/uploads/1/3/4/5/134509924/9076220.pdfIn PDF document text
    • https://nitelozam.weebly.com/uploads/1/3/5/3/135308565/titodu_kirajig_paxemenobuvumot.pdfIn PDF document text
    • http://eeeeeyyy.space/mitikegozuzade9nc91.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/fefepalevaz_nabevewadilodiz_dawam_sisupifate.pdfIn PDF document text
    • https://valowitezud.weebly.com/uploads/1/3/5/9/135993777/tevojo.pdfIn PDF document text
    • http://copyrightreports.com/56423821901grmwa.pdfIn PDF document text
    • http://nicechange.space/litoxamelesugofikeslupb.pdfIn PDF document text
    • http://khanapoorti.com/when_did_germany_and_japan_leave_the_league_of_nationsm8sdb.pdfIn PDF document text
    • https://vefutafefu.weebly.com/uploads/1/3/4/8/134882527/disux_vodanakab_tavumanelib_mudewenemezuw.pdfIn PDF document text
    • https://rusizatigaj.weebly.com/uploads/1/3/4/0/134041601/jesetuna.pdfIn PDF document text
    • https://gituwelogasof.weebly.com/uploads/1/3/2/8/132814340/2ef23e70.pdfIn PDF document text
    • https://wumetitazidizo.weebly.com/uploads/1/3/4/8/134885052/5756248.pdfIn PDF document text
    • http://study-english-05.site/tavofebnyeo5.pdfIn PDF document text
    • http://nijaxubazaziw.mypressonline.com/what_is_5d_code_on_whirlpool_washer.pdfIn PDF document text
    • https://bafewalu.weebly.com/uploads/1/3/5/3/135350628/c4c19699e45.pdfIn PDF document text
    • http://zolekumosex.iblogger.org/rozovuwazositi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b45a19eb-6616-4766-b345-2d699574266a/vilidajal.pdfIn PDF document text
    • http://kuxatirimupuv.rf.gd/lizubogaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aa52938-84d8-4c14-b7bf-2753a52438e3/wagomotupus.pdfIn PDF document text
    • http://xefiposokupama.myartsonline.com/3501794793.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_off0000f904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF904 5624 bytes
SHA-256: 2c9bbff599a2a10f02e6db256b7f6f9577cf409b1bbdf5ce521573a0d99a5146
font_01_sfnt_off00010c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1D 10548 bytes
SHA-256: 959e1344e601ddd93ea920b454b30bbff26bacde23daed6c2fabcd95e1eab8e1

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