Malicious PDF — malware analysis report

Static analysis result for SHA-256 721d9082c4099784…

MALICIOUS

PDF

80.2 KB Created: 2021-02-27 08:13:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 407a42966b20a5c593270443d1147ae8 SHA-1: 7c48e15c522235dbec4aa5bf713528a9d9741244 SHA-256: 721d9082c40997842e3fe80433084fab9953ff180deb48f08a7b18d2439cb2bf
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both a machine learning classifier and ClamAV, flagging it as a phishing trojan. The primary malicious behavior observed is the presence of a large link farm within the document, directing users to numerous external URLs. These URLs are likely intended for SEO manipulation or to host phishing content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/aws?utm_term=fuji+fz+2000+zoom+battery PDF link annotation
    • https://silajawa.weebly.com/uploads/1/3/4/3/134339193/nobevobe.pdfIn PDF document text
    • http://itash.space/lagu_boruto_opening_5_fullgz6x8.pdfIn PDF document text
    • https://valutakawewa.weebly.com/uploads/1/3/1/3/131378791/webowofukowajekumumo.pdfIn PDF document text
    • http://vagiburenumow.iblogger.org/77751385977.pdfIn PDF document text
    • https://batapasupo.weebly.com/uploads/1/3/1/4/131482803/pifapilegasa.pdfIn PDF document text
    • https://kijesutezex.weebly.com/uploads/1/3/5/3/135328712/f86f3b.pdfIn PDF document text
    • https://dunifavopugi.weebly.com/uploads/1/3/5/3/135312205/lixuwu.pdfIn PDF document text
    • https://sakobapo.weebly.com/uploads/1/3/3/9/133999770/pawewamexoja-lunodi-vosixizupod-potilalasutupaj.pdfIn PDF document text
    • https://kizozadasope.weebly.com/uploads/1/3/1/1/131164448/turebato.pdfIn PDF document text
    • https://dodikajopofibu.weebly.com/uploads/1/3/4/7/134704264/858876.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://buwanizun.epizy.com/what_does_the_fog_symbolize_in_heart_of_darkness.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/kokejidexegetotizekilexur.pdfIn PDF document text
    • http://jimetos.rf.gd/festool_track_saw_parallel_guide.pdfIn PDF document text
    • http://javisan.epizy.com/clothes_vocabulary_activities_worksheet.pdfIn PDF document text
    • http://gavojomizam.epizy.com/aeroplane_jattan_de_song_djjohal.pdfIn PDF document text
    • http://zujawuka.epizy.com/60383075253.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/puzulizamamedazewuxas.pdfIn PDF document text
    • http://zuwosopawekaz.rf.gd/76141437938.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BD 5412 bytes
SHA-256: eba0bcd038eaa793b493e794743bb707e3d1912bedbaf435ed475687c847bcef
font_01_sfnt_off0000dbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB8 5076 bytes
SHA-256: 7c56bc9671d8aaf2054a578d8d641a450e5215ec070aff659a551985f4df95ea
font_02_sfnt_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 7084 bytes
SHA-256: 550be4bec376a4297f0ed55e9dd3eb5ec0efa4d46a886a174fc29cd863a8a65b
font_03_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 10728 bytes
SHA-256: eb64b9d47d8ba5e1d4d5214a13e1be7502d6d8a8c14b970df73099237cae1ccb
font_04_sfnt_off00012427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12427 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e