Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1050b0fcc552db…

MALICIOUS

PDF

68.1 KB Created: 2021-04-01 10:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8356b6226b7692e9713e8020e15e847f SHA-1: ab7b1d6ac239c4d6f0d77a0255f770cb6a454b85 SHA-256: 4c1050b0fcc552db2428df3987966dc26ba35650a83bc2bae75d06a23af9c2c7
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-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://golowaki.ru/award?keyword=belmont+campus+map+pdf PDF link annotation
    • http://winoorama.website/enlargement_maths_worksheet_with_answersexuvx.pdfIn PDF document text
    • http://scrlt.xyz/esquires_bedford_gig_guideoo3bq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374380/normal_600c1fc1403a0.pdfIn PDF document text
    • https://povemiloten.weebly.com/uploads/1/3/4/6/134608376/0c856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489237/normal_60369b5e1e461.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378618/normal_5fe5bb90b03c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_605bb8147ddd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496204/normal_60276e0ed2c4f.pdfIn PDF document text
    • http://swast-group.website/cost_accounting_101mhp64.pdfIn PDF document text
    • https://jopokiwajisi.weebly.com/uploads/1/3/4/1/134108554/virawatu-nolufavu-puruwefilapof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452865/normal_604955aa4aa2f.pdfIn PDF document text
    • http://instapriz24.online/impossible_motor_bike_stunts_2019_mega_ramp_gamesxj8c2.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373757/normal_601ba1265fa01.pdfIn PDF document text
    • http://job-finder.space/aap_se_mausiiquii_songs136qx.pdfIn PDF document text
    • http://best-ital.fun/puburimepuxuxegavunodpg87m.pdfIn PDF document text
    • http://luchdobro.site/80537364903nxpv5.pdfIn PDF document text
    • https://nesipemuwazona.weebly.com/uploads/1/3/4/8/134881126/d9e424f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xakizeko.epizy.com/autocad_2020_tutorial_3d.pdfIn PDF document text
    • http://rimamosapike.epizy.com/lego_ninjago_movie_minifigures_feel_guide.pdfIn PDF document text
    • http://nexiwamuwi.rf.gd/nafodalotopagogor.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_off0000cf45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF45 5256 bytes
SHA-256: c6bde136510379aa52e9d485a765390c6e925038ddb46b2199b707d4d2d52d78
font_01_sfnt_off0000e117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE117 10040 bytes
SHA-256: 9cf6209838237db46a608a176c020046d545d3686795f699f084b3917a6c4f8e

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