Malicious PDF — malware analysis report

Static analysis result for SHA-256 5660b828f86a748f…

MALICIOUS

PDF

67.2 KB Created: 2021-02-20 00:01:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 366a16f8f477d7b253d5fced13047774 SHA-1: 2df893ed80181055309194ef46c6db68ade824f4 SHA-256: 5660b828f86a748f15893fb6b2d61416568b4c793711b07cbad91a0c49166401
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 0.9998

Heuristics 6

  • 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 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://druttle.ru/strik?utm_term=the+tale+of+the+three+brothers+harry+potter+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386363/normal_60257c8b03e2d.pdfIn PDF document text
    • https://xunopigiwigon.weebly.com/uploads/1/3/1/6/131636761/d68b4ea8cd58ab4.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuwegijelo/frAKjbH/lenovo_ideapad_3_14_inch_case.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/rSigM9T/goo_goo_galaxy_slime.pdfIn PDF document text
    • https://zedowegekinusil.weebly.com/uploads/1/3/3/9/133997302/bezaro_ramewil.pdfIn PDF document text
    • https://cdn.sqhk.co/xusopusavo/PjfpNTv/14474884585.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/4130768.pdfIn PDF document text
    • https://fupelesanu.weebly.com/uploads/1/3/1/6/131606305/paxofo_melanipumuwuwe_gularizonewoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/konafomaz/ihhtn7U/18724174104.pdfIn PDF document text
    • https://cdn.sqhk.co/penazavoxu/Ushdzig/how_to_mix_paint_for_wagner_spray_gun.pdfIn PDF document text
    • https://legukofa.weebly.com/uploads/1/3/5/3/135318177/sugujejepitog_jawifudiwuvoji_penol_wovujepuligapuw.pdfIn PDF document text
    • https://zavuvomexuwu.weebly.com/uploads/1/3/2/7/132740545/6e1e62d425.pdfIn PDF document text
    • https://cdn.sqhk.co/kovajivika/bgdhi2w/77481979246.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/timesheet_calculator_with_lunch_breaks.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/9612071070.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/berlitz_english_pronunciation_program.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA21 5320 bytes
SHA-256: 7d88b4e4c3ae4943118d5f3718dc148cd99f39211e6565b5493c4e7bbbe840fd
font_01_sfnt_off0000dc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 10436 bytes
SHA-256: 19433ff05f89f9cfac8e98eb13cf7cdb00548534b81de98d501ce361795c4a60

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