Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6bcbed6fa053b51…

MALICIOUS

PDF

75.3 KB Created: 2021-03-01 04:37:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e1a113c5520ffb7082cb14030acea2f2 SHA-1: e7a237a4808b5c429e403443482fe9bfb40eef75 SHA-256: f6bcbed6fa053b513bdaab2a0eca000cb132f1fa7341cfb8d3da0f85b51567b3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of external URIs and the overall structure point towards a spearphishing attachment designed to redirect users to malicious content.

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
  • 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/wix?keyword=my+solar+system+lab+worksheet+answers PDF link annotation
    • http://nurokojo.mypressonline.com/ritetemp_programmable_8022c.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/kafin.pdfIn PDF document text
    • http://defokozixeral.sportsontheweb.net/what_is_the_literature_review_section_of_a_research_paper.pdfIn PDF document text
    • https://galofufe.weebly.com/uploads/1/3/1/3/131384583/6766952.pdfIn PDF document text
    • https://josafobuwevaj.weebly.com/uploads/1/3/4/4/134464642/5b1b6.pdfIn PDF document text
    • http://jovefupe.mywebcommunity.org/used_medical_terminology_textbook.pdfIn PDF document text
    • https://puzepoxa.weebly.com/uploads/1/3/4/3/134318678/virozirir.pdfIn PDF document text
    • https://waguxezemi.weebly.com/uploads/1/3/4/7/134703223/fepujokoxilut-levodepobulofov.pdfIn PDF document text
    • https://wesamirovajep.weebly.com/uploads/1/3/5/3/135383051/2212940.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/troy_bilt_tb230_air_filter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://filanovedo.rf.gd/all_66_books_of_the_bible_in_order.pdfIn PDF document text
    • http://buwijakuwomem.rf.gd/present_and_past_perfect_tense_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/du_browser_apk_android_2._3.pdfIn PDF document text
    • http://rorazizaxaf.atwebpages.com/air_force_1_shadow_pastel.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/how_much_is_a_battery_for_a_john_deere_riding_mower.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/hazard_identification_risk_assessment_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/kuvewijuramu.pdfIn PDF document text
    • http://girofili.myartsonline.com/46551461164.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_off0000e980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 5328 bytes
SHA-256: c9011f2f200bb2ac6987d2a333d3e4a4af575485f74aaf39ddc9ac1467710794
font_01_sfnt_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 10492 bytes
SHA-256: f6cc4300519639b1daec1b54515fd61eefbed583664db0011197543c25e0b7b9

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