Malicious PDF — malware analysis report

Static analysis result for SHA-256 4938eee0471b92b8…

MALICIOUS

PDF

76.6 KB Created: 2021-03-04 19:49:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2993972f367f5df4ee4e6cd35c7e5267 SHA-1: fb5d9556cde97c0fd1c58e78cadb9c438cd35dc4 SHA-256: 4938eee0471b92b80c1e49e3a16b48ff5a54e9557020813d6830ac53b7d18fe3
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://kuzutuzo.ru/123?utm_term=old+school+tobias+wolff+analysis PDF link annotation
    • https://cdn.sqhk.co/vavegewumur/xdZYiek/79828857418.pdfIn PDF document text
    • https://cdn.sqhk.co/xajevedu/iajf7gj/88506786828.pdfIn PDF document text
    • http://expressday.online/virtual_lab_dna_and_genes_worksheet_answersmvh3u.pdfIn PDF document text
    • http://webmastervlad.ru/52757346142w2mit.pdfIn PDF document text
    • http://uscreditreport.info/how_to_program_a_magnavox_universal_remote_model_number_mc345fldv0.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/geibVdo/galoniwimuzajen.pdfIn PDF document text
    • http://vovpomnim.ru/english_story_book_appjhaxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443342/normal_6039548ef12a6.pdfIn PDF document text
    • http://topijakalez.22web.org/kinds_of_adjectives_worksheet_with_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462775/normal_5fc803b70f487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495684/normal_603cbdf8c351c.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/gdifiht/vlad_a4_omg_fake_video_calling.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495841/normal_603ce2ab1733b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490519/normal_5fe8e383c07a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gapivegek/75119319449.pdfIn PDF document text
    • http://zuzogit.rf.gd/28466074190.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/99820172357.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/ek_chiraiya_ghosle_ko_chod_song.pdfIn PDF document text
    • http://rigitusavogu.epizy.com/suruka.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/36525048052.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 5044 bytes
SHA-256: ec677e88ec85f59805ffc748161c02c8dc4f43d2885ff707a1d570dd5b1feb3a
font_01_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 10004 bytes
SHA-256: f81ad7c71464e267c92a2c75664fdd3d7cb80def69761ba73ba3f62dee97ab56
font_02_sfnt_off000116be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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