Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa2db960c2b0bf9…

MALICIOUS

PDF

79.0 KB Created: 2021-03-26 08:13:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: ff2ece24d0e543e715a9bece7a659c85 SHA-1: eefe495a998d0d266665cdbac0a2b280ad4fce6d SHA-256: 4aa2db960c2b0bf9e1a13b4fa7ba6e02f35e3183dfb9c882ac8b7053039d5414
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, indicative of a link farm. The primary URL suggests a lure related to educational certificates. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to a network of sites, potentially for SEO manipulation or to serve malicious content. The ClamAV detection and ML classifier further support its malicious nature.

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://fokemale.ru/wix?keyword=certificate+of+completion+vs+high+school+diploma+in+florida PDF link annotation
    • https://lojedakefedo.weebly.com/uploads/1/3/4/7/134743006/litakukowi-roripemefan-jinopopub.pdfIn PDF document text
    • http://vavisavig.22web.org/likebuxunogikigagire.pdfIn PDF document text
    • https://tekigeja.weebly.com/uploads/1/3/1/3/131384442/96d2ece43d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385847/normal_6043ea56dd50a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504870/normal_6053bb9cb17b2.pdfIn PDF document text
    • https://sewizafisebe.weebly.com/uploads/1/3/1/4/131437566/pewonukeraduda-gupekifapanidof.pdfIn PDF document text
    • https://cdn.sqhk.co/jawosuzexe/jiX2gih/golf_hitting_net_and_mat_for_garage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375908/normal_600a068aeecbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409110/normal_603c48b1cbfae.pdfIn PDF document text
    • https://welirupew.weebly.com/uploads/1/3/4/6/134662060/lekutovilo.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/ahdhbgi/how_to_make_fluffy_slime_without_glue_ingredients.pdfIn PDF document text
    • https://mimevomakiket.weebly.com/uploads/1/3/4/6/134693464/9077007.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/guzukeduxa.pdfIn PDF document text
    • https://tesomibafakaxag.weebly.com/uploads/1/3/4/3/134368706/zelutidagazemuju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490936/normal_600e44c465a3c.pdfIn PDF document text
    • https://zevenilusowaj.weebly.com/uploads/1/3/4/3/134324486/237953.pdfIn PDF document text
    • https://cdn.sqhk.co/woferomot/jduKvjc/77172982519.pdfIn PDF document text
    • https://cdn.sqhk.co/dowamagova/5RgdHih/art_inc._trendy_business_clicker.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vudatuvabejosix.epizy.com/letter_sheet_size_in_cm.pdfIn PDF document text
    • http://pujusojup.epizy.com/dasam.pdfIn PDF document text
    • http://livuwiga.rf.gd/free_addition_worksheet_for_2nd_grade.pdfIn PDF document text
    • http://rigawumitod.rf.gd/2001_ford_explorer_sport_trac_owners_manual.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_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 5532 bytes
SHA-256: 23f10c323a4b0439a3518b44a3ae57f3b5be961b40112eb279aa56330d39b1f9
font_01_sfnt_off00010979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 10868 bytes
SHA-256: 4c4a6ca81b5f1403fb7bb17c0dd2cdd70c03f18193142e51c611e7a2d049d07b