Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e90ae98b4c8909…

MALICIOUS

PDF

68.5 KB Created: 2021-02-27 16:39:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a1d65f884cbcb7df20a5d1494e4e4412 SHA-1: ed543e2e71da514e9f935aa338971a58ac6f8f33 SHA-256: c2e90ae98b4c89090322f7d7915d29c684dd8a3e99d943b380bf987c38c2c931
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to potentially malicious or disposable domains, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded links likely serve to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=comptia+linux%252B+study+guide+xk0-004+pdf In PDF document text
    • http://bomepufibawil.scienceontheweb.net/36757728947.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/52126744684.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/what_does_chrysanthemum_look_like.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/91336972301.pdfIn PDF document text
    • http://vezagoxutejoza.66ghz.com/donali_bandook_photo.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/henrik_ibsen_a_dolls_house_movie.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/mowazoxolag.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/32358984838.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/4137873075.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nosigegu.onlinewebshop.net/what_is_the_sum_of_exterior_angles_of_a_regular_polygon_of_nine_sides.pdfIn PDF document text
    • http://pujumek.myartsonline.com/32_bit_address_size.pdfIn PDF document text
    • http://navilifujux.rf.gd/how_long_does_it_take_to_write_morning_pages.pdfIn PDF document text
    • http://joxelugokolutu.rf.gd/parent_functions_and_transformations_video.pdfIn PDF document text
    • http://nedudumitariz.epizy.com/79447655144.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/55307627123.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/17856537774.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_off0000ce68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE68 5664 bytes
SHA-256: cca3b2b2ea986b0d1c89439d54f8d3ae433b5f39fd0e4822d1656840fe45611e
font_01_sfnt_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 10288 bytes
SHA-256: ad3576fbcf67e39f3fbdc2ff640df57934162e6088a2c1068582cd3ecea86072

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