Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c448ffcb132458…

MALICIOUS

PDF

81.5 KB Created: 2021-01-19 13:00:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 019b5e72b1814122d11b5a664038a965 SHA-1: efa66788a88fd292f80f3acc5a00179d6fdf0428 SHA-256: a4c448ffcb132458104b11b7dc92d3af142b34ac33e7131b1607047a3948760c
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a large number of embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=ohm%2527s+law+triangle+formula PDF link annotation
    • https://site-1168066.mozfiles.com/files/1168066/xapejixarinuj.pdfIn PDF document text
    • https://site-1176860.mozfiles.com/files/1176860/online_course_website_template_free.pdfIn PDF document text
    • http://nefuzixitelu.iblogger.org/zapevopuvepe.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/desodoxefawasexa.pdfIn PDF document text
    • https://site-1177387.mozfiles.com/files/1177387/manualidades_con_papel_enrollado_paso_a_paso.pdfIn PDF document text
    • https://site-1178248.mozfiles.com/files/1178248/34394631023.pdfIn PDF document text
    • https://site-1246781.mozfiles.com/files/1246781/bomarigipebusofobela.pdfIn PDF document text
    • https://site-1172884.mozfiles.com/files/1172884/nozelikejizexirol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/enterprise_risk_management_policy_template.pdfIn PDF document text
    • http://sinodigewenewe.rf.gd/faketopud.pdfIn PDF document text
    • http://fobapisarut.epizy.com/faded_violin_sheet_music_easy.pdfIn PDF document text
    • http://doroxokile.epizy.com/insert_checkbox_in_excel_sheet.pdfIn PDF document text
    • http://fepadegan.epizy.com/cabbage_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/jepevu.pdfIn PDF document text
    • http://dazigeles.rf.gd/captain_america_shield_coloring_sheet.pdfIn PDF document text
    • http://sikofus.epizy.com/45824607104.pdfIn PDF document text
    • http://nijunopuk.rf.gd/traffic_rider_mod_apk_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/pottery_barn_end_tables.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF38 5336 bytes
SHA-256: 5ddfb4984100c142889deda6ea0cd38a4b1a4c4f24eadeb42877d62faeedbd8f
font_01_sfnt_off00011145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11145 11736 bytes
SHA-256: 17b58fe00fdfd120944dbeacd03a6540161ca00a60e71d5e9494b02667413212

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