Malicious PDF — malware analysis report

Static analysis result for SHA-256 e618a319edd72ac1…

MALICIOUS

PDF

74.1 KB Created: 2021-03-30 15:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 15d61a1227ea56e919c66dbba5df4da4 SHA-1: 8e80934b28ee5e2f4858ddcfb305fe22c2d89043 SHA-256: e618a319edd72ac1f61699377ede3fa03ced50eadc322ffad2f175c40e238ea6
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://jacksth.ru/123?utm_term=english+dictionary+app+free++for+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456378/normal_601b3e414939c.pdfIn PDF document text
    • https://nagugopusoz.weebly.com/uploads/1/3/4/6/134645600/ruzepelajim_sezudin.pdfIn PDF document text
    • https://jubekufolofifi.weebly.com/uploads/1/3/4/5/134593927/61f94b82fd5.pdfIn PDF document text
    • https://cdn.sqhk.co/fizuborugas/iibjc2l/intravenous_immunoglobulin_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/simosukolevo/3WggXL4/comics_online_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475570/normal_600270eab08ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370267/normal_6011dff05cb9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479917/normal_602127ce1881b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530151/normal_5fc6c1583ff54.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/c1cdaba3-30c4-465d-844f-cbeed5e82e87/limuvofelikugozumijebobi.pdfIn PDF document text
    • http://mubidixosi.epizy.com/advanced_irish_fiddle_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b2f2fdd-0790-456e-ab5c-91431501dfa8/ice_breakers_ice_cubes_gum_nutrition_facts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8fc3730-874f-46ad-b205-0a370eae9ade/how_to_learn_online_trading_of_shares_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/992c3f33-50df-4990-9dcf-adc3de52a927/chicco_nextfit_zip_max_manual.pdfIn PDF document text
    • http://gidumelefot.epizy.com/76617555819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/802f66a5-e640-4d1f-98df-53ad66882696/59659036785.pdfIn PDF document text
    • http://fogifetegivoliv.rf.gd/stephen_king_the_boogeyman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1686746-45fd-41f3-8127-002283b28aa3/lifuzefifodoxumidasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d18a3d76-986b-4714-9f57-cdba3d6cb715/90782704999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e2269ae-7981-4fc1-8cb2-1a663e0f12d4/54873567869.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_off0000e495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 5476 bytes
SHA-256: eed788aecba6099755d02074249ed464cdaf9ba82d96602ceb07d41b200e9b3d
font_01_sfnt_off0000f742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 10528 bytes
SHA-256: a960bba396cf9bb9734d04452a519bbd349599ed7eac1977ae664b4e0c02dd5a

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