Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8dad0a0ca5ca50…

MALICIOUS

PDF

77.7 KB Created: 2020-11-14 14:45:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd96a5a0440810a5cd8aff7b432c1b66 SHA-1: d20436c0417704180d71253f44ec153d4770fdb5 SHA-256: 4e8dad0a0ca5ca50aee0c6203a6d8a9558f5afa35659b67326c091a79b962498
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lead the user to malicious content, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=perhaps+perhaps+perhaps+theme+song
    • https://zotexujefu.weebly.com/uploads/1/3/4/3/134322023/aea08628bf0c.pdf
    • https://sibikobibe.weebly.com/uploads/1/3/4/0/134040949/vifivaribu_dogegob_xirukowepasopa.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/nidisetati.pdf
    • https://lodobimamavudug.weebly.com/uploads/1/3/4/3/134306091/monunexafo.pdf
    • https://pudegubazamase.weebly.com/uploads/1/3/1/1/131163945/bopej.pdf
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/volojopotevo-misapoxovalina-zanuxiri.pdf
    • https://zazusixalug.weebly.com/uploads/1/3/4/4/134491239/xuxegarimalazamuw.pdf
    • https://xexasatokotubeg.weebly.com/uploads/1/3/4/3/134354060/nosexesusul_wazenunimave.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gulapore/gawokiz.pdf
    • https://s3.amazonaws.com/gopuze/cisco_networking_academy_curriculum.pdf
    • https://uploads.strikinglycdn.com/files/19746be2-1273-4730-87fb-f8c08124bfd9/92606432250.pdf
    • https://s3.amazonaws.com/mexesazaxasa/brain_based_learning_lesson_plans.pdf
    • https://s3.amazonaws.com/fotojipifuzitul/vikirekuwiwonizo.pdf
    • https://s3.amazonaws.com/fogibi/sijituw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d00e.bin
df4f7c3c23472bec5b5220821c4483fc45d7f3a01a04d5b6b865a520febd0b5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD00E 4676 bytes
font_01_sfnt_off0000e070.bin
aefedeedd97570ba420087de6911d23a4bd16e8845b8fa080b0c8879801b64b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE070 4944 bytes
font_02_sfnt_off0000f107.bin
a7407364d881b22008525e2e6d992acb90f78561977b9f3e66b1f7d790f840f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 12868 bytes
font_03_sfnt_off0001198f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1198F 4324 bytes

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