Malicious PDF — malware analysis report

Static analysis result for SHA-256 72767555d3e76bec…

MALICIOUS

PDF

72.9 KB Created: 2021-01-23 14:55:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5c51240c58c05deb7cd23d3cba036c92 SHA-1: e0fa4985a92d141764e5e404018ca5e739d538f6 SHA-256: 72767555d3e76becc694c31bee0104a06b5b6540e726104e1c79876687693c7e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 phishing or trojan payload. It contains numerous embedded URLs, with a primary suspicious URL being https://druttle.ru/123?utm_term=ny+state+math+test+2017, which is presented as a 'Ny state math test 2017' in the document body. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm designed to redirect users, likely to a malicious site.

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://druttle.ru/123?utm_term=ny+state+math+test+2017 PDF link annotation
    • https://vopasigujar.weebly.com/uploads/1/3/0/8/130813381/xofete.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383925/normal_5ffd64873c4f5.pdfIn PDF document text
    • http://nutigunejome.22web.org/62109406962.pdfIn PDF document text
    • https://site-1176708.mozfiles.com/files/1176708/buribekuvaj.pdfIn PDF document text
    • https://gexawagezawa.weebly.com/uploads/1/3/2/6/132682787/6c9e8c3f5138.pdfIn PDF document text
    • https://site-1176001.mozfiles.com/files/1176001/zatavusitufejugesej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483837/normal_5fc5c9127a4f0.pdfIn PDF document text
    • https://gitikaru.weebly.com/uploads/1/3/4/9/134901111/gififupujivabe_birikupogana_noxomu_wijuzibep.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/c6a5324ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402940/normal_5ff29a66abe8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443617/normal_5fcbf6326263b.pdfIn PDF document text
    • https://site-1176088.mozfiles.com/files/1176088/nearpod_lessons_for_kindergarten.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gezexibubaju.rf.gd/baby_animation_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/dobufosukokan.pdfIn PDF document text
    • http://kovemipenege.rf.gd/punctuation_exercises_with_answer_key.pdfIn PDF document text
    • http://fugirar.epizy.com/how_to_report_a_drug_dealer_anonymously.pdfIn PDF document text
    • http://naditoliwinudev.epizy.com/kigozujotefuvuzubexepo.pdfIn PDF document text
    • http://robebiwasufilu.epizy.com/dediluwamolesofevubepoged.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_off0000e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 5272 bytes
SHA-256: f439d9acd816f751cd35089cb122c4fe95186773cf32dc25ec7670d9e09b39fd
font_01_sfnt_off0000f27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 10528 bytes
SHA-256: 5c2d2877e6fe9ead27c5de72f5ed5b6f4185a6b5bae509b9a741a889976bf7cc

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