Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d4f26054167dc3…

MALICIOUS

PDF

78.2 KB Created: 2021-05-14 05:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb4c26d6a0ca0afbc11aa290e42b7529 SHA-1: d2c5045d8e1d2f82e1c7abf25710995c411afac8 SHA-256: a4d4f26054167dc3e558519e51d72897f10d8dfe0f55e6a5815c123b7a3ddf9a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://nipisod.ru/strik?utm_term=stacking+kit+for+washer+and+dryer+lg
    • https://vuxabodunufa.weebly.com/uploads/1/3/1/4/131407539/bf673d71488735.pdf
    • http://fajujefa.getenjoyment.net/windows_10_annotate_pen.pdf
    • https://salotoniv.weebly.com/uploads/1/3/5/3/135305201/vabuvafekutivazo.pdf
    • https://mokadipubozot.weebly.com/uploads/1/3/2/3/132303064/08020.pdf
    • http://nizulekun.iblogger.org/nei_gong_benefits.pdf
    • http://motubudasuvapan.medianewsonline.com/zewanosobotak.pdf
    • http://pugorot.mygamesonline.org/fabuzojuzazoxabudatuvose.pdf
    • http://mumolazesinidix.getenjoyment.net/damip.pdf
    • http://dibowofu.22web.org/zapiwipafusirakuwav.pdf
    • http://jedusajinud.mygamesonline.org/how_many_scoville_units_is_taco_bell_hot_sauce.pdf
    • https://nuxutesinof.weebly.com/uploads/1/3/1/4/131437012/pubukasawaxudes.pdf
    • https://boxuxavuviw.weebly.com/uploads/1/3/4/7/134716171/tuwovapetux_sexix.pdf
    • https://rumarefux.weebly.com/uploads/1/3/1/0/131070750/2519560.pdf
    • http://zujewubowufonug.scienceontheweb.net/jixalajoviwudotu.pdf
    • https://barigager.weebly.com/uploads/1/3/1/3/131398159/wowinonejeda.pdf
    • http://wiwalubezit.22web.org/gejala_sepsis_adalah.pdf
    • http://sijemogezabusa.sportsontheweb.net/49316540177.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_603ff39589f54d078068ffc3c74ac857.pdf?index=true
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_afc85570bf874f029c9670c49e368577.pdf?index=true
    • http://suwewonopega.epizy.com/89344956556.pdf
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_978af07eb0344bbd9020da170e1e2011.pdf?index=true
    • http://lepevalir.rf.gd/laruwazatopisege.pdf
    • http://laxukumelukadut.myartsonline.com/dr_scholls_pedicure_foot_spa_instructions.pdf
    • http://wewamamewiler.atwebpages.com/xabokufitodulube.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ab.bin
0a3a8081818efeb9d1cf503991d5cd75532f02383cc6e8073959b6ba9621892a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 5644 bytes
font_01_sfnt_off000104f6.bin
5a04baae76da1cb91e3ac93ffbb0108ea3f045b3ece21b7d15a27f2ba5e56239		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 11480 bytes

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