Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1479d18dff4079f…

MALICIOUS

PDF

76.7 KB Created: 2021-04-02 02:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 803a12218b90e26a768c3b1f3637f7ee SHA-1: 268aebf34e03f0f4d9ef80831eeb05bba9c4acb2 SHA-256: c1479d18dff4079f9a01571cf80ae0a57622fb900198f5dc3aab32af2f623cfb
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata related to its creation as a PDF, and the presence of embedded URLs confirms its role in directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://seumenha.ru/award?keyword=vector+integral+calculus+problems+and+solutions+pdf PDF link annotation
    • https://cdn.sqhk.co/jezumasulej/jcgdheL/35471494077.pdfIn PDF document text
    • http://libidisebosuv.22web.org/94752061738.pdfIn PDF document text
    • http://gekiwejal.scienceontheweb.net/antimicrobial_peptides_methods_and_protocols.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/XCgedic/zibiduwu.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/kezuvojemukumek.pdfIn PDF document text
    • http://fejelomixariji.22web.org/solution_of_pollution.pdfIn PDF document text
    • http://saripituxupagek.sportsontheweb.net/how_to_start_dog_daycare_business.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/ieigieM/slime_videos_on_youtube_karina_garcia.pdfIn PDF document text
    • http://tikopariwoxa.mygamesonline.org/pubowedabolakox.pdfIn PDF document text
    • https://cdn.sqhk.co/pewesopefim/Eii2Mth/zinafemu.pdfIn PDF document text
    • http://viwafuxofiseko.getenjoyment.net/wokaxonovine.pdfIn PDF document text
    • http://kopaburak.sportsontheweb.net/71638717640.pdfIn PDF document text
    • http://xofenejilomoz.iblogger.org/free_printable_graph_paper_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://josuguremim.epizy.com/naxotam.pdfIn PDF document text
    • http://romevakamijoke.epizy.com/introduction_to_analytical_biochemistry.pdfIn PDF document text
    • http://vulebodifoguvar.epizy.com/practical_auditing_notes.pdfIn PDF document text
    • http://vawolanuxoreg.epizy.com/looking_forward_to_your_answer.pdfIn PDF document text
    • http://devoleresi.rf.gd/how_to_use_mods_on_ps3_skyrim_steam.pdfIn PDF document text
    • http://pedagodisulor.epizy.com/finding_angle_measures_of_a_right_or_isosceles_triangle_given_angles_with_variables.pdfIn PDF document text
    • http://xamojivegubon.epizy.com/favupipedokonepabajif.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_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 5580 bytes
SHA-256: 113108f247233e14b06fe6c836d8b7fc04c6184a285e1d1c4b3991d4a787a47d
font_01_sfnt_off0000ff70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF70 11144 bytes
SHA-256: c35f5b1c8adf02009fdb7851827a20eec807baac895f334ced85fd555581d438

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