Malicious PDF — malware analysis report

Static analysis result for SHA-256 375f35df12ace42d…

MALICIOUS

PDF

73.2 KB Created: 2021-02-27 19:05:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: de13187731ce640b91c8c17419125d07 SHA-1: 889a895e25887eb61fbc489534a7392729852747 SHA-256: 375f35df12ace42de049bf8663d4ff8398c658ce8c73c1d468f6bed1cedef6ff
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The document body, though partially corrupted, suggests a lure related to academic citation, which is a common pretext for phishing. The presence of numerous external URIs indicates an attempt to redirect the user to potentially malicious sites for further exploitation.

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://xajibur.ru/strik?utm_term=how+to+cite+a+published+interview+in+apa PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421767/normal_600045cde7879.pdfIn PDF document text
    • https://xevomixu.weebly.com/uploads/1/3/0/7/130776485/7002183.pdfIn PDF document text
    • http://ufenmac.com/teenage_chore_list_templates0h135.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/master_cleanse_daily_recipe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481423/normal_5ff23ce7b719d.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/4142194191.pdfIn PDF document text
    • http://hq-cleartv.info/shakespeare_the_tempestjmq44.pdfIn PDF document text
    • http://zazonowipudu.66ghz.com/32040287557.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/attack_on_titan_movie_part_1_review.pdfIn PDF document text
    • https://tuxakosubulep.weebly.com/uploads/1/3/4/0/134012578/185709.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/what_speed_do_airbags_deploy_up_to.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446782/normal_602bee5ad6130.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nogojituwizax.epizy.com/22035111230.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/vezaxidazana.pdfIn PDF document text
    • http://pasukebufi.rf.gd/html_form_template_design.pdfIn PDF document text
    • http://wunozoviwo.epizy.com/pisejepivazizapabepixezad.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_off0000e0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C3 5412 bytes
SHA-256: b0d3b4f4a68a75a7eaed716aa220d73846bc03cfd764f6ab9cac03d292e69cc8
font_01_sfnt_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 10704 bytes
SHA-256: 56ffcc5b0919d7579ed2bcd602a4971426cffd43b2dd3f8983a8cbf3d7284da8

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